At a 0.01 significance level, we do not have enough evidence to support the claim that 72% do not fail in the first 1000 hrs of their use.
What is the null hypothesis in statistics?
The null hypothesis in inferential statistics states that two possibilities are the same. The null hypothesis states that the observed difference is solely due to chance. The likelihood that the null hypothesis is true can be calculated using statistical tests.
Sample size, n =1500
The sample proportion of the chips that do not fail in the first 1000 hrs of their use, [tex]\hat{p} = 0.69[/tex]
Null Hypothesis, H0: p=0.72
Alternate Hypothesis, [tex]Ha: p \neq 0.72[/tex]
Test statistic,
[tex]z= \frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{n}}} - \frac{0.69-0.72}{\sqrt{\frac{0.72(1-0.72)}{1500}}} = -2.5877[/tex]
Critical Value,
[tex]Z_{0.05/2} =[/tex]±1.96
Now, since the absolute value of the test statistic i.e, 2.5877 is greater than the absolute value of the critical value i.e, .1.96, thus we will reject the null hypothesis.
Thus at a 0.01 significance level, we do not have enough evidence to support the claim that 72% do not fail in the first 1000 hrs of their use.
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Evaluate the expression and enter your answer in the box below.
|42|
Answer:
42
Step-by-step explanation:
because the distance between 42 and zero is 42
y= 3x + -2
y= x -4
HELP ME
Answer:
y=-3x+2 y=-x-4
Step-by-step explanation:
Solve each inequality. Use the number line provided to test intervals.
Thank you!! :)
Answer: x ∈ {-0.5, -5, -12.5}
Step-by-step explanation: To solve the inequality 2x³ + 21x² + 60x + 25 > 0, we first need to find the values of x that make the inequality true. We can do this by setting the expression equal to 0 and solving for x.
We can start by factoring the expression to make it easier to solve. Notice that 2x³ + 21x² + 60x + 25 is a polynomial with a leading coefficient of 2 and a constant term of 25. This means that it has the form (x + a)(x + b)(x + c), where a, b, and c are constants.
We can start by factoring out the common factor of 2x from the first two terms: 2x³ + 21x² + 60x + 25 = 2x(x² + 10.5x + 12.5). Now we can see that the expression has the form (x + a)(x + b)(x + c), where a = 0.5, b = 5, and c = 12.5.
So, we can rewrite the expression as (x + 0.5)(x + 5)(x + 12.5) = 0. Now we can solve for x by setting each factor equal to 0 and solving for x:
x + 0.5 = 0 => x = -0.5
x + 5 = 0 => x = -5
x + 12.5 = 0 => x = -12.5
Therefore, the values of x that make the inequality true are x = -0.5, x = -5, and x = -12.5.
Now we need to determine which of these values make the inequality 2x³ + 21x² + 60x + 25 > 0 true. To do this, we can substitute each of the values of x into the inequality and see which ones make the inequality true.
When x = -0.5, the inequality becomes 2(-0.5)³ + 21(-0.5)² + 60(-0.5) + 25 > 0, which simplifies to -0.5 + 5.25 - 15 + 25 > 0. This is true, because the left-hand side is 29 > 0.
When x = -5, the inequality becomes 2(-5)³ + 21(-5)² + 60(-5) + 25 > 0, which simplifies to -125 + 525 - 300 + 25 > 0. This is also true, because the left-hand side is 225 > 0.
When x = -12.5, the inequality becomes 2(-12.5)³ + 21(-12.5)² + 60(-12.5) + 25 > 0, which simplifies to -391.25 + 1181.25 - 750 + 25 > 0. This is also true, because the left-hand side is 1147.5 > 0.
Therefore, the solution to the inequality is x ∈ {-0.5, -5, -12.5}. This means that the values of x that make the inequality true are x = -0.5, x = -5, and x = -12.5. The inequality is satisfied when x is any of these values.
So far, you proved that one pair of parallel sides in a parallelogram
must be congruent. Add to your proof to prove that both pairs of
parallel sides in a parallelogram must be congruent.
Geometry
Both the pairs of opposite sides in a parallelogram are parallel and congruent.
According to the question,
We've proved that one pair of sides in parallelogram must be congruent
Let ABCD is a parallelogram ,
We know that AB // CD
Here, AC is transversal for the parallel lines AB and CD
So, ∠BAC = ∠DCA (Using interior angle property) --------(1)
Similarly , We also know that BC // AD
=> ∠BCA = ∠DAC -----------(2)
Now , In ΔABC and ΔADC,
∠BAC = ∠DCA from (1) AC is common side∠BCA = ∠DAC from (2)Therefore , ΔABC ≅ ΔADC (as per ASA congruence rule)
Therefore , AB = CD and BC=AD (Corresponding sides of congruent triangles are equal)
Hence , Both the pairs of opposite sides in a parallelogram are parallel and congruent.
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Find the GCF if 8 and 15
A.1
B.2
C.3
D.5
1 is the greatest common factor of 8 and 15 .
What is GCF ?GCF stand for greatest common factor.It is a set of numbers is the largest factor that each and all the number share. GCF is also often used to find the common denominator.
First we need to write common factor of each number.
The common factors of 8 = ( 1,2,4,8)
The common factor of 15= (1,3,5,15)
1 is the only one common factor here which is divides both 8 and 15.
So 1 is the only and GCF of 8 and 15.
Thus, 1 is the right answer.
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I need help with this asap please
Answer: C
Step-by-step explanation:
-2 and 2 add up to 0
Answer:
c
Step-by-step explanation:
-2 + 2 =0
a person casts a shadow that aligns with a shadow of a tree. the person is 5.5 feet tall and casts a shadow 8.25 feet long. the trees shadow measures 22.5 feet long
Part A: write and equation you can use to find the trees hight.
Part B: How tall is the tree? How far is the person standing from the tree?
An equation that can be used to determine the tree's height is 22.5/8.25 = x/5.5.
The height of this tree is equal to 15 feet.
The distance of this person from the tree is equal to 14.25 feet.
What are the properties of similar triangles?In Geometry, two (2) triangles are similar when the ratio of their corresponding sides are equal in magnitude and their corresponding angles are congruent.
Additionally, two (2) geometric figures are considered to be congruent only when their corresponding side lengths are congruent and the magnitude of their angles are congruent.
Now, we can write an equation that can be used to determine the tree's height. Since the ratio of the corresponding sides of similar triangles are equal in magnitude, we have the following mathematical expression (equation):
22.5/8.25 = x/5.5
Where:
x represents the height of the tree.
How tall is the tree?22.5/8.25 = x/5.5
Cross-multiplying, we have:
8.25x = 22.5 × 5.5
8.25x = 123.75
x = 123.75/8.25
x = 15 feet.
How far is the person standing from the tree?The distance of this person from the tree can be calculated as follows;
Distance = Length of tree's shadow - Length of person's shadow
Distance = 22.5 - 8.25
Distance = 14.25 feet.
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Jack has 18 fewer points than Aria, who has x points.
Answer: x-18
Step-by-step explanation:
Suppose our student center published data that the average starting salary for college graduates is 59k. You randomly sampled 49 college graduates and calculated the sample average salary is 44k. What test can you use to check whether the true average is 59k?.
To check whether the true average is 59k or not, A sample mean T-Test needs to be conducted.
What is an Average?
In the field of statistics, average means that the ratio of the sum of the numbers of a given set, to the total number of characters in a given set. It is also called as the Arithmetic mean.
It is given that the student center has published the data that the average salary of the college graduates is 59k. Accordingly, the sample of 49 college students were verified and the sample average salary came out to be 44k.
When we analyze the given question, we find that,
The total number of students were 49,
The true average was found to be 59k,
and the Sample average is found to be 44k.
Thus, in the present question we will use the One- sample T-test.
We used this test, as the statistical hypothesis test is used to find if the unrecognized population mean is different from the specific value.
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josh and dan each want to save $600 to attend a sports camp. josh has saved 60% of the amount. dan $320 .who saved more money?
what number solud you multipluy both sides by to solve for x
The amount of money that Josh has is more than the amount of money that Dan has.
What is the percentage?The amount of any product is given as though it was a proportion of a hundred. The ratio can be expressed as a quarter of 100. The phrase % translates for one hundred percent. It is symbolized by the character '%'.
The percentage is given as,
Percentage (P) = [Final value - Initial value] / Initial value x 100
Josh and Dan each need to save $600 to go to a games camp. Josh around has saved 60% of the amount. Dan has $320.
The amount of money that Josh has is given as,
⇒ 60% x $600
⇒ 0.6 x $600
⇒ $360
The amount of money that Josh has is more than the amount of money that Dan has.
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Question 5 of 15
Solve: 6+ x/2 = 1/4(x − 4) – 1
OA. There are infinitely many solutions.
OB. x=-16
OC. x= 32
OD. X=-32
PLEASE HELP ME HURRY❗️❗️❗️❗️❕
Answer: x= -32
Step-by-step explanation:
6+x/2=1/4(x-4)-1
6 +x/2 = 1/4x -1 -1 distribute
6+ x/2 = 1/4x -2 combine like terms
(6+x/2) = (1/4x -2) Find GCF for denominator
4(6+x/2) = 4(1/4x -2) GCF is 4 so multiply by 4 on both sides
24 +x = x-8 add 8 on both sides
32+x=x subtract x
32=-x divide by -1 on both sides
-32= x
|-2c-3| > -4
Absolute value inequality
The solutions of the absolute value inequality.
|-2c-3| > -4
are all the real numbers.
How to solve the absolute value inequality?Here we have a really trivial inequality, which is:
|-2c - 3| > -4
Notice that we have an absolute value there, and the absolute value is defined as:
|x| = x if x ≥ 0
|x| = -x if x < 0
Then the absolute value |x| is always equal to or larger than zero, so:
|x| > -4
Is true for any value of x.
Then our inequality:
|-2c - 3| > -4
Is true for any value of c, because the left side is always equal to or larger than 0, and 0 > -4
So c can be any real number.
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What is the value of the rational expression below when x is equal to 5?
15-x
x-10
OA. 10
O.B. -2
OC. 2
O D. -10
Answer: A. 10
Step-by-step explanation:
Plug in x which is 5 to equation 1
15-5=10
Plug in x which is 5 to equation 2
5-10= -5
A common guideline for constructing a 95% confidence interval is to place upper and lower bounds one standard error on either side of the mean.
True
False
False. Because a 95% confidence interval is two standard errors on either side of the mean.
What is a 95% confidence interval?
If 100 separate samples were taken and a 95% confidence interval was calculated for each sample, then around 95 of the 100 confidence intervals would contain the actual mean value (), according to the definition of a 95% confidence interval.
For a 95% confidence interval, the value lies within 2 standard deviations of the normal distribution.
For upper and lower bounds one standard error on either side of the mean is 68%.
So, the 95% confidence interval is two standard errors on either side of the mean.
Hence, the given statement is False.
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Solve the equation for y.
x = 4y-2
y=
Answer:
Step-by-step explanation:
the mean of five positive integers is 1.5 times their median. four of the integers are 8, 18, 36 and 62, and the largest integer is not 62. what is the largest integer?
The largest number of the five positive integers is 146.
Mean:
The mean is the mathematical average of a set of two or more numbers. The arithmetic mean and the geometric mean are two types of mean that can be calculated. The formula for calculating the arithmetic mean is to add up the numbers in a set and divide by the total quantity of numbers in the set.
Median:
The median is the middle value in a set of data. First, organize and order the data from smallest to largest. To find the midpoint value, divide the number of observations by two. If there are an odd number of observations, round that number up, and the value in that position is the median.
Here we have to find the largest integer.
Data given:
Four of the five integers are 8, 18, 36, and 62.
It is given that mean of five numbers 1.5 times their median.
mean = (8+18+36+62 + x)/5
median = 36
mean = 1.5 × median
(124 + x) / 5 = 1.5 × 36
124 + x = 5 × 54
x = 270 - 124
= 146
Therefore we get the largest number as 146.
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given f (x) = 2x + 7 describe how the value of k affects the slope and y intercept of the graph of g compared to the graph of f 9 (x) = (2x +7) - 6
The slope of both functions remains the same, there is no effect of the value of k on a slope.
What is a slope?Slope or the gradient is the number or the ratio which determines the direction or the steepness of the line.
Change in the value of y-intercept. For f(x) y-intercept is 5 and for g(x) y-intercept is 2.
The given functions are :
f(x) = 2x + 5
g(x) = ( 2x + 5) -3
From the graph of both functions,
Let us consider two pairs of coordinates to find the slope,
For f(x)
(0,5) and ( -2, 1)
The slope of f(x)
m= ( 1- 5) / (-2 -0)
m= 2
For g(x) at (0,2) and (-1, 0) slope of g(x),
m = ( 0-2) / (-1-0)
m = 2
The slope remains unaffected.
y-intercept of f(x) , put x = 0
⇒ y = 5
y-intercept of g(x) , put x = 0
y =(0+ 5) -3
y = 2
Change in the value of y-intercept due to the value of k = -3.
Therefore, for the given function f(x) = 2x + 5 and g(x) = ( 2x + 5) -3, the effects of the value of k on slope and y-intercept are as follows:
The slope of both functions remains the same, there is no effect of the value of k on a slope.
Change in the value of y-intercept. For f(x) y-intercept is 5 and for g(x) y-intercept is 2.
The graph is attached.
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A circle is centered at (−5, 8) and has a radius of 7. Which of the following is the equation of this circle? Group of answer choices (x + 5)2 + (x − 8)2 = 49 (x + 5)2 + (x − 8)2 = 7 (x − 5)2 + (x + 8)2 = 7 (x − 5)2 + (x + 8)2 = 49
The equation of the circle centered at (−5, 8) and having a radius of 7 is (x + 5)² + (y - 8)² = 49.
What is the equation of the circle centered at (−5, 8) and has a radius of 7?The standard form of the equation of a circle is expressed as;
x² + y² = r²
The horizontal (h) and vertical (k) translations represents the center of the circle.
Hence;
(x - h)² + (y - k)² = r²
Given the data in the question;
Center of the circle: (−5, 8)
h = -5k = 8r = 7Equation of the circle = ?Now, plug the values of h, k and r into the equation above and simplify,
(x - h)² + (y - k)² = r²
( x - (-5) )² + ( y - 8 )² = 7²
(x + 5)² + (y - 8)² = 49
Therefore, the equation of the circle is (x + 5)² + (y - 8)² = 49.
Hence, option A is the correct answer.
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Tessa has a new beaded necklace. 18 out of the 45 beads on the necklace are blue. What
percentage of beads on Tessa's necklace are blue?
Answer: 40%
Step-by-step explanation: 18/45 = x/100
divide 100 by 45 and you get 2.22 repeating.
multiply 2.22 by 18 and you get 40%
Step by step please help asap !!!!!!!
Answer:
3,31
Step-by-step explanation:
i dont got steps for this but i think thats the right answer
In triangle , the measure of angle is 50° and the measure of angle 70°. What is the measure of the exterior angle to angle ?
Answer:
60
Step-by-step explanation:
50+70=120
180-20=60
Answer:
120°
Step-by-step explanation:
Your question didn't include an image or angle names, so it was pretty confusing to get what you were asking for. If you were asking for the exterior angle of the missing angle, then here's your answer:
The 3 angle measures of a triangle will always equal 180.
Since we've already got two angles, all we need to do is a simple equation to get our missing angle:
180-(50+70)=60
Now that we've got the missing angle, we need to calculate the exterior angle, the thing we're here for. We know (hopefully at this point) that an exterior angle and its interior angle are a linear pair, meaning that the two add up to 180. Knowing this, we can do this equation to finish off the question:
180-60=120
And there's your answer, 120°
There's also a shorter way of doing this, let me know if you'd like to see it. But for now, hope I helped!
Pennylvania ha 51 mile of coat along Lake Erie and 57 mile horeline along the Delaware Etuary. The total ditance around Pennylvania i about 1000 mile. How much of that ditance around Pennylvania i not horeline?
the total distance around Pennsylvania is not shoreline will be 892 miles.
What is the arithmetic operation?
The four fundamental operations of arithmetic are addition, subtraction, multiplication, and division of two or more quantities. Included in them is the study of numbers, especially the order of operations, which is important for all other areas of mathematics, including algebra, data management, and geometry. The rules of arithmetic operations are required in order to answer the problem.
Pennsylvania has 51 miles of coast along Lake Erie and a 57-mile shoreline along the Delaware Estuary.
The total distance around Pennsylvania is about 1000 miles.
So the distance around Pennsylvania is not shoreline will be 1000-(57+51) = 892miles
Hence, the total distance around Pennsylvania is not shoreline will be 892 miles.
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if the measure of an interior angle of a regular polygon is 120 degrees, how many sides does the polygon have?
Answer:
6 sides
Step-by-step explanation:
since the measure of an interior angle of a polygon can be found with the formula 180(n-2) / n where n is the number of sides we can substitute 120 to the answer and cross multiply to find that
120n = 180(n-2)
120n = 180n-360
360 = 60n
n = 6
In someone infected with measles, the virus level N (measured in number of infected cells per mL of blood plasma) reaches a peak density at about t = 12 days (when a rash appears) and then decreases fairly rapidly as a result of immune response. The area under the graph of N(t) from t = 0 to t = 12 (as shown in the figure) is equal to the total amount of infection needed to develop symptoms (measured in density of infected cells x time). The function N has been modeled by the function f(t) = -t(t - 21)(t + 1). Use this model with six subintervals and their midpoints to estimate the total amount of infection needed to develop symptoms of measles.
The total amount of infection needed to develop symptoms of measles is 7840
Consider the model,
N(t)= f(t)=-t(t-21)(t+1).
The area of the graph of N(t) from t=0 to t = 12 is,
N(t)dt
Use six subintervals and their midpoints to estimate the above as follows:
Here, a=0,b=12, n=6
The length of each subinterval is,
h= b-a/n = 12-0/6
=2
So, the midpoints of each subinterval are 1, 3, 5, 7, 9, and 11.
Use Midpoint Rule,
A = [N(t)dt]
= At[ƒ (1) + ƒ (3) + ƒ (5) +ƒ(7)+ƒ(9)+ƒ(11)] =2[40+216+480+784+1080+1320]
= 7840
Thus, the total amount of infection needed to develop symptoms of measles is 7840.
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the polynomial that represents the volume of the box is 6x3 32x2 2x - 40. find the volume of the box if x is 4 inches.
the polynomial that represents the volume of the box is is 6x^3 +5x^2 -3x-2
V=lwh
l=x+1
w=2x+1
h=3x-2
V=(x+1)(2x+1)(3x-2)
V=(x*2x+x*1+1*2x+1*1)(3x-2)
V=(2x²+x+2x+1)(3x-2)
V=(2x²+3x+1)(3x-2)
V=2x²*3x+2x²*(-2)+3x*3x+3x*(-2)+1*3x+1*(-2)
V=6x³-4x²+9x²-6x+3x-2
V=6x³+5x²-3x-2
complete question is
Find the volume of the box. Use the formula V = lwh.
Rectangular box with sides x plus 1, 2x plus 1, and 3x minus 2.
6x3 – 2
6x3+ x – 2
6x3 – 13x2 – 3x – 2
6x3 + 5x2 – 3x – 2
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(03.06 MC)
Aurora is planning to participate in an event at her school's field day that requires her to complete tasks at various stations in the fastest time possible. To prepare for the event, she is practicing and keeping track of her time to complete each station.
The x-coordinate is the station number, and the y-coordinate is the time in minutes since the start of the race that she completed the task.
(1, 3), (2, 6), (3, 12), (4, 24)
Part A: Is this data modeling an arithmetic sequence or a geometric sequence? Explain your answer. (2 points)
Part B: Use a recursive formula to determine the time she will complete station 5. Show your work. (4 points)
Part C: Use an explicit formula to find the time she will complete the 9th station. Show your work. (4 points)
A) The data models a geometric sequence
B) Using a recursive formula, the time she will complete station 5 is; 2
C) Using a explicit formula, the time she will complete station 9 is; 512
How to find the Recursive Formula?A) From the given coordinates (1, 3), (2, 6), (3, 12), (4, 24), we can say that when x increases by 1, y is multiplied by 2. Thus, as the quotient between consecutive terms is the same, the data depicts a geometric sequence.
B) The recursive formula for a geometric sequence with common ratio r and first term a₁ is given by the formula:
f(n) = a₁(r)ⁿ⁻¹
Since a₁ = 2 and r = 1, then we have;
f(1) = 2(1)¹⁻¹
f(1) = 2
f(5) = 2
C) The explicit formula from the calculations above will be;
aₙ = 2ⁿ
Thus;
a₉ = 2⁹
a₉ = 512
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The sum of two numbers is 19. The second number is 2 more than twice the first number.
Answer: 5[tex]\frac{2}{3}[/tex]
Step-by-step explanation:
19=(x+(2x+2))
Subtract 2 from each side
17=x+2x
17=3x
Divide each side by 3
[tex]\frac{17}{3}[/tex] = x
5 [tex]\frac{2}{3}[/tex] = x
A cardboard carrying box has the dimensions shown below. How many square inches of cardboard are needed to make the box?
What is 35.7 divided by 0.07
Answer:
510
Step-by-step explanation:
Answer: The answer is 510
Step-by-step explanation:
35.7/0.07 = 510
Find the slope of the line through (7,-6),perpendicular to y=4x+2
Answer:
4y+x+17=0Step-by-step explanation:
y=4x+2
For a point to be perpendicular to a line
then the product of the two gradients must be negative one (I.e, m1×m2=-1)
where m1= 4
m2=-(1/m1)
m2=-1/4
point (7,-6)
x1=7 y1=-6
from the general equation of a line
y-y1=m(x-x1)
y-(-6)=-1/4(x-7)
y+6=-1/4(x-7)
y+6=-1/4x+7/4
y+1/4x=(7/4)-6
y+1/4x=-17/4
y+1/4x+17/4=0
4y+x+17=0