in how many ways may a student mark a 20 questions test, if 7 questions mark correctly and 13 incorrectly?

Answer: A

Step-by-step explanation: To solve this problem, we need to use the properties of triangles and the given information to determine the measure of angle C.

First, we can use the fact that angle A is opposite angle C to deduce that angles A and C are congruent (i.e. they have the same measure). This means that the measure of angle C is 25 degrees.

Next, we can use the fact that triangle AABC is isosceles (i.e. it has two sides of equal length) to deduce that angle B is also 25 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle A is 25 degrees and angle C is 25 degrees, then the remaining angle, angle B, must be 180 - (25 + 25) = 130 degrees.

We can also use the fact that triangle AEFG is isosceles to deduce that angle F is also 100 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle E is 100 degrees, then the remaining angle, angle F, must be 180 - 100 = 80 degrees.

Finally, we can use the given information that the measure of angle Z is 25 degrees and the measure of angle F is 100 degrees to deduce that the measure of angle X is 180 - (25 + 100) = 55 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, and we have already determined the measures of two of the angles (angles Z and F).

Therefore, the measure of angle C is 25 degrees, which means the correct answer is A) 125 degrees.

With a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.

What is a confidence interval?

An area surrounding a measurement that indicates how accurate it is called a confidence interval.

Here, we have

Confidence interval is written as

Sample proportion ± margin of error

Margin of error = z × √pq/n

Where

z represents the z score corresponding to the confidence level

p = sample proportion. It also means the probability of success

q = probability of failure

q = 1 - p

p = x/n

Where

n represents the number of samples

x represents the number of success

From the information given,

n = 14

x = 6

p = 6/14 = 0.42

q = 1 - 0.42 = 0.58

To determine the z score, we subtract the confidence level from 100% to get α

α = 1 - 0.95 = 0.05

α/2 = 0.05/2 = 0.025

This is the area in each tail.

Since we want the area in the middle, it becomes

1 - 0.025 = 0.975

The z score corresponding to the area on the z table is 2.05. Thus, Thus, the z score for a confidence level of 95% is 1.96

Therefore, the 95% confidence interval is

0.42 ± 1.96√(0.58)(0.42)/14

The lower limit of the confidence interval is

0.42 - 0.25 = 0.17

The upper limit of the confidence interval is

0.42 + 0.25 = 0.67

Hence, with a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.

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The worth of the stock after the increase is $14.375.

Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations.

Based on the information given, the addition expression will be:

= Original value + Increase

= $11.50 + (1/4 × $11.50)

= $11.50 + $2.875

= $14.375

The value is $14.375.

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Adjacent angles of a parallelogram are supplementary.

[tex]y+3y=180 \\ \\ 4y=180 \\ \\ y=\boxed{45} \\ \\ \\ \\ 3(45)+3x=180 \\ \\ 45+x=60 \\ \\ x=\boxed{15}[/tex]

Expression [tex]\frac{x^7y^5}{x^2y^3}[/tex] can be simplified as x⁵y² by applying laws of components.

An algebraic expression is consists of variables, numbers with various mathematical operations,

The given expression is,

[tex]\frac{x^7y^5}{x^2y^3}[/tex]

Simplify the expression by using law of exponents [tex]a^n/a^m =a^{(n-m)[/tex],

The expression can be rewritten as,

= [tex]x^{(7-2)}{y^{(5-3)}[/tex]

= x⁵ y²

The expression can be simplified as x⁵y².

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Answer:

The answer is 1902

Step-by-step explanation: You use pemdas. First you ansewer whats in the parentheses then exponents then add

Answer:

1902

Step-by-step explanation:

10^2= 100

9+10= 19

2+100(19) 19*100=1900 and then add 2 to get 1902

If we live on the moon, a day on the Moon is about a lunar month long

The correct answer is an option (c)

We know that a day is the length of time between two noons or sunsets. A day is of 24 hours on Earth and 708.7 hours (which is 29.53 Earth days) on the moon.

We know that a lunar month is nothing but the time the Moon takes to go around the Earth.

A lunar month is of approximately 29.53 days.

This means, a day on the Moon is about a lunar month.

Therefore, a day on the Moon is of 708.7 hours i.e., about a lunar month.

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Answer:

-4/5 (fraction)

Step-by-step explanation:

add the numbers:

25x^2-16=0

use quadratic formula

simplify -40/50

-4/5

The mean service time from the ​customers are between 161.5 to 164.7 seconds.

The trade magazine QSR routinely checks the​ drive-through service times of​ fast-food restaurants.

A 90% confidence interval that results from examining 607 customers in Taco Bell's drive-through has a lower bound of 161.5 seconds and an upper bound of 164.7 seconds.

Let's denote the mean service time by μ. Then, note that, we are given that n=607. Also, we are said that a 90% CI for μ is given by

(161.5,164.7)

This implies that we are 90% confident that μ lies in the interval. Or to be precise, this interval is a realization of a random interval that has 90% probability of covering the true mean. Thus, we are 90% confident that the mean service times of the restaurants are between 161.5 to 164.7 seconds.

Hence the answer is The mean service time from the ​customers are between 161.5 to 164.7 seconds.

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Answer:

19

Step-by-step explanation:

3^2+3+7

9+3+7

12+7

19

Hopes this helps please mark brainliest

Answer:

no

Step-by-step explanation:

Part a: Ignoring those that are bigger than 4.

Part b: labeling the random number.

Part c: conclusion, Claire should plan to purchase 12 boxes.

Part a: random number table;

Part b: labeling the random number.

7318495907 05179 51002(10 boxes) 8337452297 07769 99792 78365 9348772753 36216 (15 boxes) 07230 35793 71907 65571 66784(10 boxes) 25548 91861 15725.

Part c: conclusion,

On average, Claire should plan to purchase 12 boxes.

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The area between one standard deviation and either side of mean is 34%

The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all observed data will fall within three standard deviations (denoted by σ) of the mean or average (denoted by µ).

In particular, the empirical rule predicts that 68% of observations falls within the first standard deviation (µ ± σ)

95% within the first two standard deviations (µ ± 2σ)

99.7% within the first three standard deviations (µ ± 3σ).

According to the question,

If we place the flag 1 standard deviation on either side of the mean

which means flag is placed either on (µ + σ) or ( (µ - σ)

and Using Empirical rule,

68% of area lie under (µ ± σ)

Therefore , Area between either  (µ + σ) or ( (µ - σ) = 68 / 2

=> 34%

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Answer:

5r

Step-by-step explanation:

r+r+r+r+r=5r

The probability of rolling a 3 the first time and a 3 the second time is 1/36.

Given that,

There are two rolls of one die.

We have to determine the probability of receiving a 3 both the first and second times.

We know that,

There are 6 faces on a die.

Of these 6 faces, one of them is 3 and one of them is 3

So, the probabilities of rolling a 3 and a 3 are:

P(3) = 1/6

P(3) = 1/6

The probability of rolling a 3 the first time and a 3 the second time is calculated as follows:

Pr=P(3)×P(3)

This gives

Pr=1/6×1/6

Multiply

Pr=1/36

Therefore, the probability of rolling a 3 the first time and a 3 the second time is 1/36.

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Hence, the indicated side hypotenuse is [tex]46[/tex].

What is the angle?

Angles are an integral facet in the study of mathematics, particularly geometry. Angles are formed by two rays (or lines) that begin at the same point or share the same endpoint. The point at which the two rays meet (intersect) is called the vertex.

Let us assume the angle name [tex]x[/tex] and  the triangle [tex]ABC[/tex], and the hypotenuse is [tex]y[/tex].

Here given angle and side are

[tex]x=30[/tex] degree

And the side [tex]AB=23[/tex]

Now we are applying the [tex]sine[/tex] because it is

[tex]sinx=\frac{P}{H}[/tex]

So,

[tex]sin(30)=\frac{23}{y}\\\\\frac{1}{2}=\frac{23}{y}\\\\y=46[/tex]

Hence, the indicated side hypotenuse is [tex]46[/tex].

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I don't know for certain if you are trying to write this in standard form, graph it, or so forth. However, here is the standard form.

Standard Form:

[tex](x+2)^2+(y-2)^2=36\\[/tex]

Hope this helps you!

Answer: 36, 42, 78

Step-by-step explanation:

20 is only divisible by 2
50 is only divisible by 2
45 is only divisible by 3
36/2=18 36/3=12
42/2=21 42/3=14
78/2=39 78/3=26

Answer: 36, 42, 78

Step-by-step explanation:

36/2= 15, 36/3=12

42/2= 21, 42/3=14

78/2=39, 78/3=39

When the null hypothesis is rejected possible a Type i error has occurred.

Let's Understand what is null hypothesis?

A statistical hypothesis known as a null hypothesis asserts that no statistical significance can be found in a set of provided observations. Using sample data, hypothesis testing is used to judge a hypothesis' veracity. It is sometimes referred to as just "the null" and its symbol is [tex]H_{0}[/tex].

We have total 4 cases:

[tex]H_{0}[/tex]  accepted when  [tex]H_{0}[/tex] is true ->  Correct decision

[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is true -> Type i Error  when null hypothesis is  present and we have rejected

[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is false -> Type ii Error when null hypothesis is not  present but we have accepted

[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is false -> Correct decision.

So according to question null hypothesis is rejected so we have two options Either Null hypothesis is present or not present.

if it is present  then it is Type i Error.

if it is not present then it is Correct decision.

So when the null hypothesis is rejected possible a Type i error has occurred.

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There is a 0.044% probability of having exactly 8 boys in a sample of 10 births.

Simply put, the probability is the likelihood that something will occur.

When we don't know how an event will turn out, we can discuss the likelihood or likelihood of several outcomes.

Statistics is the study of events that follow a probability distribution.

For instance, there is only one way to receive a head and there are a total of two possible outcomes, hence the probability of flipping a coin and getting heads is 1 in 2 (a head or tail).

P(heads) = 1/2 is what we write.

So, X is the proportion of boys among n particular births. Let p represent the likelihood of having a boy at a certain birth.

Here n=10.

Additionally, because male and female births are equally likely, there is a 50% chance of having a boy or a girl.

P(Boy) = P(girl) = 0.5

p = 0.5

Based on the information provided, there will be a defined number of trials (n) of 10, with a constant chance of success (p).

Furthermore, every trial stands alone from the others.

So, with n=10 and p=0.5, X follows a binomial distribution.

The following is the probability function of the binomial distribution for the k number of successes, where x = k.

[tex]\mathrm{P}(\mathrm{X}=\mathrm{k})=(10 C k) 0.5^k(1-0.5)^{10-k}[/tex]

Finding the likelihood of 8 boys in n=10 births is necessary.

P(X=8) = (10C8)0.5⁸(1-0.5)¹⁰⁻⁸

= 45 × 0.0039 × 0.25

P(X = 8) = 0.0438

Therefore, there is a 0.044% probability of having exactly 8 boys in a sample of 10 births.

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Answer: The glass of water has inertia

Step-by-step explanation: The trick works no matter how heavy an object is since friction is weaker for lighter objects. Provided you pull quickly enough, this trick can even be done with glasses or plate

Answer:y2-y1/x2-x1

Step-by-step explanation:

The formula for rise over run or slope is y2-y1 divided by x2-x1

An example

(5,4),(3,7)

y2=7,y1=4

x2=3,x1=5

plug in and solve

7-4/3-5

slope would be -1

if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.

What is the percentage?

It's the ratio of two integers stated as a fraction of a hundred parts. It is a metric for comparing two sets of data, and it is expressed as a percentage using the percent symbol.

A confidence interval is a range that shows how precise the measurement is.

if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.

Also a 90 percent confidence interval would be narrower than a 95 percent confidence interval

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Step-by-step explanation:

the table was filled correctly already by somebody yesterday.

the important thing to remember is that an arc angle is always measured at the center point of the circle. that is the difference to angles between the intersecting lines of arc segments.

it would be really important that you start doing these things yourself. this hands-on experience of these (really basic) questions is designed to help you get a feeling how these things work together, which makes later topics much easier for you.

please tell me what you don't understand here. you only need to apply common sense. no magic voodoo math formulas or strategies.

FAR = 100° FR = 140° VO = 60° FR+VO = 200°

FAV = 80° FV = 60° RO = 100° FV+RO = 160°

OAV = 100° VO = 60° FR = 140° VO+FR = 200°

OAR = 80° RO = 100° FV = 60° RO+FV = 160°

how did we get the measures of the intercepted arcs ? by counting the 20° segments on the arc. the full circle arc represents 360°. always, for every circle. one time around is one time around and therefore 360°, no matter the size of the circle.

when you stand directly on the south pole of the Earth for 24 hours, you will have rotated the full 360° in that time (one rotation per day). if you stand on the equator for 24 hours, the Earth has taken you on one spin of the full 360°. the difference is the absolute arc length and the necessary speed at which we cover the distance of a full arc length.

every 250 million years our whole sogar system rotates once (by the full 360°) around the center of our galaxy.

the degrees have nothing to do with radius, diameter, area, ... of a circle. only with the relative parts of the circumference. when the minute arm of a clock moved for 15 minutes, then it went 90° around the clock's face. after 60 minutes it went the full 360°, and the cycle starts anew.

so, minutes on a clock or hours of the day are just another way of counting degrees around a circle.

what have we noticed with the sum of the measures of the intercepted arcs ?

many things.

e.g.

they are exactly twice as large as the line angles. 100 to 200. 80 to 160.

the sum of 2 pairs of opposing arc angles is always 360°.

...

so, how will we get the line angles based on the sum of the angles of the intersected arcs ?

we cut the sum of the intersected arc angles in half. 200 to 100. 160 to 80.

Answer:

has to be c other wise it would make sense

The acceleration of the truck when it has a mass of 5000 kg and the truck driver presses on the brakes is 1.2m/s².

The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations.

The orientation of an object's acceleration is determined by the orientation of the net force acting on that object's acceleration, which is the rate at which velocity changes over time in terms of both speed and direction. A point or object moving in a straight line is accelerated if it accelerates or decelerates.

Acceleration will be:

= Force / mass

= 6000 / 5000

= 1.2 m/s²

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Answer:

Step-by-step explanation:

Answer:

f(4)= 45

Step-by-step explanation:

f(x)=3x^2-3. (1)

f(4)=?

so we have to put x=4 in equation (1)

we get

f(4)=3[(4)^2]-3

f(4) =3(16)-3

f(4)= 48-3

f(4)= 45 Answer...

The largest possible value for the decimal $a. B + c. D$  us:

9.7 + 8.6 which results to 18.3.

Given that a, b, c, and d are different numbers (from 1 to 9), we are to find the largest possible value of a.b + c.d.

This problem can be answered by trial and error and with some logic. Clearly, a to d cannot be at the lower end of the values (1 to 5). Since the digits must be different, it can be a combination of digits from 6 to 9.

It is rather tempting to say that the 9.8 + 7.6 would yield the highest possible sum (=17.4) but this is incorrect. Since it is the sum of two numbers with a decimal, we have to maximize on the ones digit first before maximizing the tenths digit. Therefore: the combination of numbers must then be:

9.7 + 8.6 which results to 18.3

9.6 + 8.7 yields 18.3 as well.

Hence we get the required answer,

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