t-distribution in the bank or restaurant to get the customer arrival time is a b) normal distribution.
The t-distribution is defined by degrees of freedom. These are related to sample size. The t distribution is most useful when the sample size is small, the population standard deviation is unknown, or both. As the sample size increases, the t-distribution will become more normal.
The t distribution is the continuous probability distribution of z scores when the estimated standard deviation is used in the denominator instead of the true standard deviation. The purpose of the t-test is to compare a specific characteristic that describes the groups, and the means will be representative of the populations that are normally distributed.
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which test should be used to determine if a difference exists between the proportion of all ucf and usf students who prefer to use hand sanitizer?
the proportion of all ucf and usf students who prefer to use hand sanitizer is in between 2.646% and 7.65%
What is z test?
If the data is distributed normally, a z test can be used to determine whether the means of two populations differ from one another. The z test statistic's value must be determined, together with the null hypothesis and alternative hypothesis setups, for this reason. On the z critical value, the decision criterion is based. The distribution graph is divided into acceptance and rejection zones during hypothesis testing by the z critical value. The null hypothesis can be rejected if the test statistic lies inside the rejection region; otherwise, it cannot.
When there are multiple alternatives accessible, hypothesis testing is utilised. To decide whether to accept or reject the null hypothesis, the z test is performed in the mean, which determines the t value. This value is then compared with the p value. The alternate explanation in this case is mu, which is represented. For P1 and P2, the 90% confidence interval is (- 0.0765, 0.02646).
Hence, the proportion of all ucf and usf students who prefer to use hand sanitizer is in between 2.646% and 7.65%
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Erica has some stickers in her sticker album. Each week she plans to add 9 stickers. Erica had 50 stickers after 4 weeks. Assume the relationship is linear. Find the rate of change and initial value.
Rate of change: 9
Initial value: 14
explanation:
9 x 4 = 36 (she adds 9 stickers every week, it's 4 weeks)
50 - 36 = 14 (subtract what she added to find initial value)
the graph below shows the relationship between the number of hours cody works and the amount of money he earns at his job. Write a true statement about his relationship.
The true statement about his relationship is that the hours worked is directly proportional to the money earned.
What is the relationship shown in the graph?We know that a graph could be used to show the relationship between variables. This relationship can be shown by the use of the cartesian coordinates. The cartesian coordinates is directed in the x and the y plane as shown in the image in the question.
Now, we can see that the line of best fit that was drawn through the data points is point upwards. This would show us that as the number of hours worked is increasing, the money earned is also increasing.
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Consider the expression (2.3x6)+(2.3x4)
Evaluate the expression. Show your work.
Answer: 23
Step-by-step explanation: To evaluate the expression (2.3x6)+(2.3x4), we can first use the order of operations to simplify the expression. Since the multiplication and division have the same precedence, we can evaluate them from left to right. Therefore, we have: (2.3x6)+(2.3x4) = (2.36)+(2.34)
Next, we can evaluate the multiplication to get: (2.36)+(2.34) = 13.8 + 9.2
Finally, we can evaluate the addition to get: 13.8 + 9.2 = 23
Therefore, the value of the expression (2.3x6)+(2.3x4) is 23.
Can someone help me with this??
Step-by-step explanation:
H is the plan
F is the side
A is the plan
hope it helps.. please mark brainliest
a bowl contains 75 balls. of these, 10 are white, 11 are red, 12 are blue, 13 are green, 14 are yellow and 15 are black. what is the smallest number of balls that can be selected from the bowl to be certain that at least one ball of every color is chosen?
We have to use pigeonhole principle to find balls from bowl. From 75 balls at least one out of 31 balls will be of black color, out of 23 balls will be red, out of 25 will be blue, out of 27 balls will be green, out of 29 will be yellow.
out of 75 balls for each ball to be chosen at least once then we have to compute each color of ball separately,
By using the pigeonhole principle's formula n(r - 1) + 1
For red ball,
N=11, k=1, [N/2]≥3
= 11(3-1)+1
= 23
Hence, out of 23 balls from 75 balls at least one will be of red color
For, blue ball
N=12, k=1, [N/2]≥3
= 12(3-1)+1
= 25
Hence, out of 25 balls from 75 balls at least one will be of blue color
For green color,
N=13, k=1, [N/2]≥3
= 13(3-1)+1
= 27
Hence, out of 27 balls from 75 balls at least one will be of green color
For yellow ball,
N=14, k=1, [N/2]≥3
= 14(3-1)+1
= 29
Hence, out of 29 balls from 75 balls at least one will be of yellow color
For black ball,
N=15, k=1, [N/2]≥3
= 15(3-1)+1
= 31
Hence, out of 31 balls from 75 balls at least one will be of black color
The pigeonhole principle states that if n items are put into m containers, where n > m, at least one container must contain more than one item. If there are k+1 or more pigeons dispersed throughout the k pigeonholes, at least one pigeonhole will have two or more pigeons. Proof. The statement's converse is that there can only be a maximum of k pigeons if each slot can only accommodate one bird.
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circumference of a circle is 26.19. Find the diameter of the circle
If I’m doing fractions on a number line how do I do thirds
Answer:
Step-by-step explanation:
it would be devided into 3 sections so the thing would look like this
M is the midpoint of AC. A is (3, -9) and C is (-5, 16). Solve for the following
Answer:
[tex]M=\left(-1, \dfrac{7}{2} \right)[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{7.4 cm}\underline{Midpoint between two points}\\\\Midpoint $=\left(\dfrac{x_2+x_1}{2},\dfrac{y_2+y_1}{2}\right)$\\\\\\where $(x_1,y_1)$ and $(x_2,y_2)$ are the endpoints.\\\end{minipage}}[/tex]
Given endpoints:
A (3, -9)C (-5, 16)Substitute the given points in the midpoint formula:
[tex]\implies M=\left(\dfrac{x_C+x_A}{2}, \dfrac{y_C+y_A}{2} \right)[/tex]
[tex]\implies M=\left(\dfrac{-5+3}{2}, \dfrac{16+(-9)}{2} \right)[/tex]
[tex]\implies M=\left(\dfrac{-2}{2}, \dfrac{7}{2} \right)[/tex]
[tex]\implies M=\left(-1, \dfrac{7}{2} \right)[/tex]
height of the building is 50m. The angle from Nikko to the top of the building is 25 degrees. How far is Nikko from the Building? Draw a picture first
Answer:
107 meters
Step-by-step explanation:
You want Nikko's distance from a 50 m high building if the angle of elevation to the top is 25°.
TangentThe tangent relation tells you the acute angle in a right triangle is related to the sides by ...
Tan = Opposite/Adjacent
ApplicationIn this problem, the relation means ...
tan(25°) = building height / distance to building
Solving for the distance to the building, we get ...
distance to building = (building height)/tan(25°) = (50 m)/tan(25°)
distance to building ≈ 107.225 m
Nikko is about 107 meters from the building.
A satellite flies 136640136640 miles in 17. 817. 08 hours. How many miles has it flown in 9. 879. 87 hours?.
If a satellite flies 136640 miles in 17.8 hours then in 9.87 hours the satellite flows down to 75766.6 miles
Given that:
A satellite flies 136640 miles in 17.8 hours
We will find the unit rate first,
Unit rate = 136640/17.8
Unit rate = 7676.40 miles per hour.
Miles flown in 9.87 hours,
Miles flown = 7676.40 × 9.87
Miles flown = 75766.6 miles
Hence Miles flown in 9.87 hours is 75766.6 miles
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100x100x325x1773x3.44554x34444x6i78754x23324
Answer:
1.097174699×10^²⁶
Step-by-step explanation:
100×100×325×1773×3.44554×34444×6878755×23324=
1.097174699×10^²⁶
How can dilation scale factors help you identify points on a line passing through the origin given one additional point?
Answer options on the image.
The correct option for the dilation scale factor is-
The scale factor can be used by forming right triangle with the vertices at the origin, the additional Point P, and a leg along the x-axis.Explain the term dilation scale factor?The image's size will depend on the scale factor, which is used to dilate a mathematical entity (compared to the original object). An expansion happens when the scaling factor's absolute value exceeds one.Measure the distance from the dilation's center to a point just on preimage as well as the distance from the axis to a point on the final image.The following is a basic formula to determine a dilated figure's scale factor: Scale factor is equal to the difference between the dimensions of the old and new shapes.By creating a right triangle with vertices just at origin, Point P as an extra point, and a leg down the x-axis, the scaling factor can be applied.
Thus, this triangle will plot a new point, the image of P, on the line with any dilation given to it.
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The scatter plot shows the relationship between the average number of nightly customers and the number of months since a restaurant opened. The equation represents the linear model for this data. y = 5x + 120 What does the number 120 in the equation mean in this context? The restaurant has been open for 120 months. There were 120 customers per month after the restaurant was open 5 months. The number of customers per night increases by 120 each month. For every 5 months the restaurant has been open, there are 120 more customers per night. There were 120 customers per night when the restaurant opened. Number of Customers 300 270- 240- 210- L 180- ! 150- 120- Average nightly customers'
The number 120 in the equation of y = 5x + 120 mean is there were 120 customers per night when the restaurant opened.
How to read equation?For this case, the equation of y = 5x + 120 is for linear relationship.
Which is
y represent average number of nightly customer.
x represent number of months the restaurant opened.
For example for month 0 or for the first time restaurant open the nightly customer is,
y = 5(0) + 120
y = 0 + 120
y = 120
It mean the average number of nightly customer is 120 in the first time restaurant open. After month 0, in month 1 the nightly customer is increase by 5. So, total average nightly customer is 125, and so on.
Attached graph is for visualization and to make it easier to understand the equation mean.
Thus, number 120 in the equation is to represent there were 120 customers per night when restaurant opened.
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consider the following binomial experiment: a study in a certain community showed that 6% of the people suffer from insomnia. if there are 10,400 people in this community, what is the standard deviation of the number of people who suffer from insomnia?
Using the binomial probability concept, the standard deviation of the number of people who suffer from insomnia is =24.21
What is binomial probability?
When an experiment or survey is repeated numerous times, the likelihood that the results will be SUCCESS or FAILURE is known as the binomial distribution. The prefix "bi" implies "two" or "twice," therefore the term "binomial" refers to a distribution type with two probable outcomes. A coin flip, for instance, can only result in one of two outcomes: heads or tails, and completing a test can result in either passing or failing.
standard deviation =[tex]\sqrt{n*p(1-p)}[/tex]
p = probability of success = 6% = 0.06
1 - p = 1 - 0.06 = 0.94
Sample size, n = 10400
Substituting the values into the equation :
[tex]\sqrt{10400*0.06(1-0.04)}[/tex]
[tex]\sqrt{10400*0.06(0.94)}[/tex]
[tex]\sqrt{10400*0.0564}[/tex]
[tex]\sqrt{586.56}[/tex]
= 24.21
Hence, the standard deviation is 24.21.
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A seasoning blend is 4\%4%4, percent onion powder, by mass. How much pure onion powder should they include in a 72\,\text{g}72g72, start text, g, end text bottle to make the final blend have 20\ , percent onion powder? khan academy
They need to put 14.4 grams of onion powder in each bottle.
Given,
The quantity of onion powder in a seasoning blend = 4%
We have to find the quantity of pure onion powder should they include in a 72g bottle to make the final blend have 20% onion powder;
How much is a percentage?
A percentage is a certain number or part in every hundred. It is a fraction with the denominator 100, and the symbol for it is "%."
Here,
Let x be the seasoning blend.
Now, 4% of 72=20% of x
⇒ 0.04×72=0.2×x
⇒ 0.2x=2.88
⇒ x=2.88/0.2
⇒ x=14.4 g
Therefore, a container should contain 14.4 grams of onion powder.
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john drove for 3 hours at a rate of 50 miles per hour and for 2 hours at 60 miles per hour. what was his average speed for the whole journey?
The average speed of John for the whole journey is 54km/h.
What is the average speed?Calculating average speed involves dividing the total distance traveled by the total time it took to cover that distance.
Speed is the rate of movement of something at a specific time.
Average speed refers to the average speed over the course of a journey.
So, the average speed will be:
Distance = speed x time
d₁ = v₁ x t₁
d₁ = 50 x 3
d₁ = 150 km
d₂ = v₂ x t₂
d₂ = 60 x 2
d₂ = 120 km
So,
D = d₁ + d₂
D = 150 + 120
D = 270 km
Utilizing the S formula:
S = D/ T
S = 270 / 5
S = 54 km/hr
S = 54km/hr
Therefore, the average speed of John for the whole journey is 54km/h.
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The drama club is selling tickets to their play to raise money for the show's expenses. Each student ticket sells for $7 and each adult ticket sells for $9. There was a total of $543 in revenue from the sale of 67 total tickets. Write a system of equations that could be used to determine the number of student tickets sold and the number of adult tickets sold. Define the variables that you use to write the system.
The no of student ticket, x = 30
The no of adult ticket, y = 37
What is equation ?
An equation is a mathematical statement that proves two mathematical expressions are equal in algebra, and this is how it is most commonly used. In the equation 3x + 5 = 14, for instance, the two expressions 3x + 5 and 14 are separated by the symbol "equal."
Equations can be classified as either conditional equations or identities. Any value of the variables results in an identity being true. Only certain values of the variables in a conditional equation result in truth. When two expressions are joined together by the equals sign ("="), the result is an equation.
The drama club is selling tickets to their play to raise money for the show's expenses.
Let the student ticket be represented as x and adult ticket as y
Cost of student ticket,x = $7
Cost of adult ticket,y = $9
The total number of tickets, x + y = 67 ... (1)
There was a total of $543 in revenue from the sale of 67 total tickets.
7x + 9y = 543 ...(2)
Multiplying eq(1) by 7, we get
7x + 7y = 469 ...(3)
Subtract eq (3) from (2), we get
2y = 74
y = 37, sub in eq (1)
x = 30
The no of student ticket, x = 30
The no of adult ticket, y = 37
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Answer: Let s= the number of student tickets sold Let
Let a=the number of adult tickets sold
7s+9a=543
s+a=67
Step-by-step explanation:
the faces of each of two fair dice are numbered 1, 2, 3, 5, 7, and 8. when the two dice are tossed, what is the probability that their sum will be an even number?
The probability that the sum will be an even number on the toss of two dice is 5/9 .
In the question ,
it is given that ,
the numbers on the faces of the dice are 1, 2, 3, 5, 7, and 8 .
the probability of getting an odd number first is = 4/6 = 2/3,
the probability of getting an even number first is = 2/6 = 1/3,
To get an even, we must get either 2 odds or 2 evens.
The probability of getting 2 odds is 4/6 × 4/6 = 16/36 .
The probability of getting 2 evens is 2/6 × 2/6 = 4/36.
If we add them together,
we get ,
= 16/36 + 4/36
= 20/36
= 10/18 = 5/9
Therefore , the required probability is 5/9 .
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Express the triple integral f(x, y, z)dV as an iterated integral in cylindrical coordinates for the given function f and solid region E
Evaluate the iterated integral.
f(x, y, z) = xy ZA 256-x-y? -y E == x + y ? 0
The triple integral f(x, y, z)dV for the following function f is 256π(256 - x - y)² as an iterated integral in cylindrical coordinates.
The iterated integral in cylindrical coordinates is given by:
∫∫∫f(ρ, θ, z)dV = ∫∫∫xρcos(θ)ρsin(θ)zdρdθdz
Evaluating the integral yields:
∫∫∫f(ρ, θ, z)dV = 256π∫zdz
= 256πz²
= 256π(256 - x - y)²
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When 10 is subtracted from the square of a number, the result is 3 times the number. Find the positive solution.
The positive solution is 5.
given,
When 10 is subtracted from a number's square, the result is three times the number.
let x be the number
according to given statement the quadratic equation will be
[tex]x^2-10=3x\\\\x^2-3x-10\\\\x^2+2x-5x-10=0\\\\x(x+2)-5(x+2)=0\\\\(x-5)(x+2)=0\\\\x=5\ or\ -2[/tex]
Thus, the positive solution is 5.
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in a class of 45 student there are 12 girls what is the percentage of girls in the class?
The percentage of girls in a class are 26.67%.
What is percentage?
A percentage in mathematics is a number or ratio that is expressed as a fraction of 100. The abbreviations "pct.", "pct.", and occasionally "pc" are also used to indicate it, though the percent sign, "%," is most frequently used. A percentage has no dimensions and no standard measurement.
Given:
In a class of 45 student there are 12 girls.
We have to find the percentage of girls in the class.
Percentage of girls = (number of girls / Total number of students ) x 100
= (12 / 45) x 100
Percentage of girls = 26.6666
Percentage of girls ≈ 26.67
Hence, the percentage of girls in a class are 26.67%.
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you toss a fair coin 9 times. find the probability of no more than 8 heads given that at least one toss resulted in heads.
The probability of no more than 8 heads given that at least one toss resulted in heads will be 511/512.
What is probability ?
Mathematical explanations of the likelihood that an event will occur or that a statement is true are referred to as probabilities. A number between 0 and 1 represents the likelihood of an event, with 0 generally denoting impossibility and 1 denoting certainty.
A coin has two possibility, either head or tail.
So, there will be 2 possible outcomes when a coin is tossed.
hence, Total no. of outcomes (T) = 2^9. = 512
Now, Probability of getting one tail = 1/2^9 = 1/512
and, Probability of getting at most 8 heads
= 1 - Probability of getting one tail
= 1 - 1/512
= 511/512.
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Find an expression that produces a quotation of 9 R15 . Write the expression in the box
Pls help me :,)
The numerical will be equal to 159 ÷ 16 and the polynomial will be (9x +15)/x.
What is an expression?Mathematical actions are called expressions if they have at least two terms that are related by an operator and include either numbers, variables, or both. Adding, subtraction, multiplying, and division are all reflection coefficient operations.
In comparison to the divisor, the dividend will be 15 times greater. It seems that you are free to select any divisor. It must be more than 15 if the divisor is totally numerical.
Numerical:
Divisor = 16,
so we have,
(9×16 +15) ÷ 16
= 159 ÷ 16
Polynomial:
The simplest divisor we can have is a single variable: x.
(9x +15)/x
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35+6x-2=13x+12 solve for x
Answer:
x = 3
Step-by-step explanation:
Solve for x:
35 + 6x - 2 = 13x + 12
Simplifying on the left side:
33 + 6x = 13x + 12
Subtracting 33 on both sides:
6x = 13x - 21
Subtracting 13x on both sides:
-7x = -21
Dividing by -7 on both sides:
x = 3
What is the approximate speed of sound in the experimental medium ( speed = frequency X wavelength )
The speed will be calculated by the formula by the product of frequency and wavelength.
What is the speed of sound?The speed of sound is the distance travelled by a sound wave per unit of time as it propagates through an elastic medium. At 20 degrees Celsius, the speed of sound in air is approximately 343 metres per second or one kilometre in 2.91 seconds or one mile in 4.69 seconds.
Speed is defined as the ratio of the time distance travelled by the body to the time taken by the body to cover the distance. Speed is the ratio of the distance travelled by time. The unit of speed in miles per hour.
The speed of the sound will be calculated by the multiplication of frequency and wavelength.
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What is the value of x?
Enter your answer in the box.
x =[ ]
Answer:
(2x+2)=(3x-52)
2x+2=3x-52
2x-3x=-52-2
-x=-54
x=54
Given two rectangular ducts with equal cross-sectional area but different aspect ratios (width/height) of 2 and 4 which will have the greater frictional losses? Explain your answer
The frictional loss will be greater for aspect ratio of 2 as friction will be more when the height of the duct is higher compared to the increase in width.
In a straight duct with constant cross sectional area , the velocity of the water is changed. The change in static pressure is the frictional loss .
In the duct the energy is constant. Therefore when water moves upwards with the increase in height the frictional loss or the pressure loss will be more more.
When width increases there will be less pressure, So frictional loss will be increased with height.
Let the width and height be a and b respectively.
now area = ab
and a\b =2
or, a = 2b
again a\b = 4 or, a = 4b
if ab is constant then the height for the aspect ratio of 4 is greater.
Therefore there will be more frictional loss for the increased height.
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11. MARINE BIOLOGY Killer whales usually swim at a
rate of 3.2-9.7 kilometers per hour, though they can travel
up to 48.4 kilometers per hour. Suppose a migrating killer
whale is swimming at an average rate of 4.5 kilometers per
hour. The distance d the whale has traveled in t hours can
be predicted by the equation d = 4.5t.
a. Graph the equation.
b. Use the graph to predict the time it takes the killer
whale to travel 30 kilometers.
The graph of linear function d = 4.5t and the time to cover 30km is 6.67s
Linear FunctionA linear function is of the form f(x) = mx + b where 'm' and 'b' are real numbers. Isn't it looking like the slope-intercept form of a line which is expressed as y = mx + b? Yes, this is because a linear function represents a line, i.e., its graph is a line. Here;
m = slopeb = y-interceptThe linear function given in the question is;
d = 4.5t
a) The graph of the function d = 4.5t is attached below.
b) The time it takes to cover 30km will be
d = 4.5t
30 = 4.5t
t = 30 / 4.5
t = 6.67 s
The time it takes to cover a distance of 30km is 6.67s
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Please help me with explanation
Answer:
[tex]5c+\frac{9-8c}{24}[/tex]
Step-by-step explanation:
Simplify
[tex]5c+\frac{1*(\frac{3}{4}-\frac{2c}{3} )}{2}[/tex]
[tex]5c+\frac{9-8c}{24}[/tex]