can some one help me pls I will give the brainlist (20 points more)

Answer:

We reject the Null and conclude that at α = 0.1, the is enough evidence to support th claim that miles per gallon has improved between 2017 and 2019

Step-by-step explanation:

This is a paired t test:

H0 : μx - μy = 0

H1 : μx - μy > 0

The test statistic :

dbar / (Sd/√n)

d = Xi - Yi

d = 2.4, 0.3, 1.7,3,-0.2, 1.1, -0.5, -3.2, 1.4, 2, 1.6, 2.2

dbar = Σd / n = 11.8 / 12 = 0.983

Sd = Σ(d - dbar)²/ (n - 1) = 1.685 (calculator)

Hence,

Test statistic = 0.983 / (1.685/√12)

Test statistic = 0.983 / 0.4864176

= 2.021

Using the test statistic score, we could obtain the Pvalue using the Pvalue FROM Tscore calculator :

Degree of freedom, df = n - 1 = 12 - 1 = 11

Pvalue(2.021, 11) = 0.03415

α = 0.1

Pvalue < α ; We reject the Null and conclude that at α = 0.1, the is enough evidence to support th claim that miles per gallon has improved between 2017 and 2019

It equals this graph expression. it's a little cropped, but I'm Sure you know about the y & x axis.

Answer:

160% of 35 is 56.

Step-by-step explanation:

[tex]\frac{56}{y} :\frac{160}{100}[/tex]

y · 160 = 56 · 100

160y = 5600

160y ÷ 160 = 5600 ÷ 160

y = 35

9514 1404 393

Answer:

  B.  3.5

Step-by-step explanation:

The given range is 20 ± 7. The empirical rule tells you 95% of scores will fall within μ ± 2σ. We know μ = 20, so 2σ = 7. That is σ = 7/2 = 3.5.

The standard deviation is 3.5.

Answer:

Step-by-step explanation:

Answer:

x = 10

5x + 4x = 909x = 909x/9 = 90/9x = 10

Step-by-step explanation:

Answer:

if you mean the face of the triangle the area equal 40 by 5×8=

and the little triangle on the left his area is 6

if you want the full area of prymaid its 24+6+6+40+32=108 its all figure areas sorry i cant understand engilish very well so i write all that

Answer:

0.2835 = 28.35% probability that exactly two of them require warranty repairs.

Step-by-step explanation:

For each TV, there are only two possible outcomes. Either they require warranty repairs, or they do not. The probability of a TV requiring warranty repairs is independent of any other TV, which means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

In which [tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by the following formula.

[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]

And p is the probability of X happening.

10% require repair to be done under the warranty during the first year service.

This means that [tex]p = 0.1[/tex]

A particular dealership sells 18 such TV per week.

This means that [tex]n = 18[/tex]

a) What is the probability that exactly two of them require warranty repairs?

This is [tex]P(X = 2)[/tex]. So

[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]

[tex]P(X = 2) = C_{18,2}.(0.1)^{2}.(0.9)^{16} = 0.2835[/tex]

0.2835 = 28.35% probability that exactly two of them require warranty repairs.

9514 1404 393

Answer:

  no

Step-by-step explanation:

Put 2 where x is and see if you get a true statement.

  1/2(2) -4 = 5

  1 -4 = 5

  -3 = 5 . . . . . . False

2 is not a solution to the equation.

__

The solution is x=18.

Answer:

125.66cm

Step-by-step explanation:

Answer:

64.9 cm

Step-by-step explanation:

Area of a sector is

[tex]A=\pi r^{2} (\frac{angle}{360} )[/tex]

r is 8 and the angle measure is 120

[tex]A=\pi 8^{2} (\frac{120}{360} )\\A=62\pi (\frac{120}{360} )\\A=64.93[/tex]

or 25.5 inches ? The question has the radius measured in cm, but asks for the answer in inches. So depending on how the actual question is worded, the answer will change.

64.9cm is equal to about 25.5 inches

Answer:

[tex]f(x) =3 * (4)^x[/tex]

Step-by-step explanation:

Given

[tex](x_1, y_1) = (1,12)[/tex]

[tex](x_2, y_2) = (0,3)[/tex]

Required

The function of the graph (exponential function)

An exponential function is represented as:

[tex]f(x) = ab^x[/tex]

For [tex](x_1, y_1) = (1,12)[/tex], we have:

[tex]12 = a * b^1[/tex]

[tex]12 = a * b[/tex]

[tex]12 = a b[/tex]

For [tex](x_2, y_2) = (0,3)[/tex]

[tex]3 = a * b^0[/tex]

[tex]3 = a * 1[/tex]

[tex]3 = a[/tex]

[tex]a = 3[/tex]

Substitute: [tex]a = 3[/tex] in [tex]12 = a b[/tex]

[tex]12 = 3 * b[/tex]

Divide both sides by 3

[tex]4 = b[/tex]

[tex]b =4[/tex]

So, we have:

[tex]f(x) = ab^x[/tex]

[tex]f(x) =3 * (4)^x[/tex]

Answer:

By the Central Limit Theorem, the distribution of ¯ x is approximately normal with mean 187 and standard deviation 2.05.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

The lengths of adult males' hands are normally distributed with mean 187 mm and standard deviation is 7.1 mm.

This means that [tex]\mu = 187, \sigma = 7.1[/tex]

Suppose that 12 individuals are randomly chosen.

This means that [tex]n = 12, s = \frac{7.1}{\sqrt{12}} = 2.05[/tex]

What is the distribution of ¯ x?

By the Central Limit Theorem, the distribution of ¯ x is approximately normal with mean 187 and standard deviation 2.05.

Step-by-step explanation:

-3x - 6+ 8x - 12 >22

5x -18 >22

5x -18 +18 >22 + 18

5x/5 > 40/5

x > 8

S.s { 1,2,3,4,5,6,7}

Answer:

117

Step-by-step explanation:

=(3)×[19+{15+8-3}]

=3×[19+{23-3}]

=3×[19+20]

=3×39

=117

Answer:b

Step-by-step explanation:

Answer:

d = 126, z = 28

Step-by-step explanation:

The angle with the variable is diagonal from the 105 degree angle. In this case, that means that they are equivalent. So, 105+21 = 126. d = 126 :)

Answer:

1 is the answer to 1/2+1/2

Answer:

1

Step-by-step explanation:

if you add 1/2 and 1/2, you get 2/2 which is also equal to 1.

Answer:

[tex]Bill\to 9\ years[/tex]

[tex]H \to 16\ years[/tex]

Step-by-step explanation:

Let

[tex]H \to Hoang[/tex]

[tex]B \to Bill[/tex]

Currently:

[tex]H = B + 7[/tex]

Two years ago

[tex]H - 2 = 2 * (B -2)[/tex]

Required

H and B

We have:

[tex]H - 2 = 2 * (B -2)[/tex]

Open bracket

[tex]H -2 =2B - 4[/tex]

Add 2 to both sides

[tex]H -2+2 =2B - 4+2[/tex]

[tex]H =2B -2[/tex]

Substitute [tex]H = B + 7[/tex]

[tex]B + 7 =2B -2[/tex]

Collect like terms

[tex]2B - B =7+2[/tex]

[tex]B = 9[/tex]

Substitute [tex]B = 9[/tex] in [tex]H = B + 7[/tex]

[tex]H = B + 7[/tex]

[tex]H = 9 + 7[/tex]

[tex]H = 16[/tex]

The solution is  3 3/4 feet as a single fraction greater than one is: 15/ 4

A fraction represents a part of a whole or, more generally, any number of equal parts. When spoken in everyday English, a fraction describes how many parts of a certain size there are, for example, one-half, eight-fifths, three-quarters.

here, we have,

given that,

3 3/4 feet

now, we have to Write 3 3/4 feet as a single fraction greater than one.

so, we have,

3 3/4

i.e. 3*4 + 3 / 4

= 15/ 4

or, we have,

3 3/4

i.e.

3/4 + 3/4 + 3/4

=9/4

now, single fraction greater than one 15/ 4 > 1.

Hence, The solution is  3 3/4 feet as a single fraction greater than one is: 15/ 4.

To learn more on fraction click:

brainly.com/question/10354322

#SPJ2

Answer:

n=-559

Step-by-step explanation:

Answer:

n=-559

Step-by-step explanation:

you need to get n by itself so you subtract 184 from both side n=-375-184 then simplify it to n= -559 leaving you with the answer.

hope this helped

Completion of question:

The Demon Drop at Cedar point in Ohio takes riders to the top of the tower and drops them 60 feet. A function that approximates this ride is h=-16^t2 + 64t + 60 where h is the height in feet and t is the time in seconds. About how many seconds does it take for riders to drop to the ground?

Answer:

4.78 s

Step-by-step explanation:

Given the equation :

h = - 16^t2 + 64t + 60

Using the quadratic formula ; where

a = - 16 ; b = 64 ; c = 60

Dropping to the ground, h = 0

16^t2 + 64t - 60 = 0

-b ± (√b²- 4ac) / 2a

-64 ± (√64²- 4(-16)(60)) / 2(-16)

-64 ± (√7936) / - 32

(-64 ± 89.08) / - 32

(-64 + 89.08) / - 32 = - 0.783 OR

(-64 - 89.08) / - 32 = 4.78

Reject the negative

t = 0.783 seconds

Answer:

1/3

Step-by-step explanation:

P(5) Represents the probability that the spinner will land on 5 after being spun once. Since 5 is one of three options on the wheel, the probability is 1/3

Answer:

117.5 cm that the answer on your question

Answer:

im pretty sure its 4

Step-by-step explanation: ur pretty to

Answer:

The interquartile range is $4

The range is NOT $4

Answer:

B

Step-by-step explanation:

The min and max numbers are 5.5 and 8.5. To find range, you subtract the bigger number by the smaller number. To find midrange, you find the median of the 2 min and max numbers.

8.5-5.5=3

5.5 6 6.5 7 7.5 8 8.5

 1   2  3   4  5   6   7

So the range is 3 and the midrange is 7.

---

hope it helps

Answer:

55.56%

Step-by-step explanation:

Answer:

55.56

Step-by-step explanation:

Answer:

A customer who sends 78 messages per day would be at 99.38th percentile.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Average of 48 texts per day with a standard deviation of 12.

This means that [tex]\mu = 48, \sigma = 12[/tex]

a. A customer who sends 78 messages per day would correspond to what percentile?

The percentile is the p-value of Z when X = 78. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{78 - 48}{12}[/tex]

[tex]Z = 2.5[/tex]

[tex]Z = 2.5[/tex] has a p-value of 0.9938.

0.9938*100% = 99.38%.

A customer who sends 78 messages per day would be at 99.38th percentile.

Answer:

Cheese sandwich on white bread and a side of potato chips

Step-by-step explanation:

Answer:

[tex](a) 78.4\% = 0.784[/tex]

[tex](b) 29\% =0.290[/tex]

Step-by-step explanation:

Required

As a decimal to nearest thousandth

Solving (a): 78.4%

[tex]78.4\%[/tex]

Express as fraction

[tex]78.4\% = \frac{78.4}{100}[/tex]

Solve fraction

[tex]78.4\% = 0.784[/tex] ----- This is already in thousandth place

Solving (b): 29%

[tex]29\%[/tex]

Express as fraction

[tex]29\% =\frac{29}{100}[/tex]

Solve fraction

[tex]29\% =0.29[/tex]

Approximate

[tex]29\% =0.290[/tex]

Answer:

2.88 miles

Step-by-step explanation:

because 3.6/.5 = 7.2

then 7.2 × .4 = 2.88