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3 years ago

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The cost of a service call to fix a washing machine can be expressed by the linear function , where y represents the total cost

and x represents the number of hours it takes to fix the machine. What does the y-intercept represent?

1 answer:

mixas84 [53]3 years ago

7 0

It would be A bud hope this helps

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Why are mathematicians like airlines?

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They both use planes.

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3 years ago

The makers of a soft drink want to identify the average age of its consumers. A sample of 25 consumers was taken. The average ag

Lelu [443]

Answer:

a.1.90 years

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this question:

$n = 25, \sigma = 3.8$

So

$M = 2.575*\frac{3.8}{\sqrt{25}} = 1.90$

So the correct answer is:

a.1.90 years

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3 years ago

All of the following are true of betas and correlation coefficients EXCEPT: Group of answer choices Both betas and correlation c

fgiga [73]

Answer:

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2 years ago

A. 10<br> B. 29<br> C. 8<br> D. 25

Sonja [21]

Answer:

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2 years ago

Read 2 more answers

Find the mean of this data set: {– 78, -12, 3, – 44}

blagie [28]

Answer:

<u>Answer</u><u>:</u><u> </u><u>A</u><u>.</u><u> </u><u>-</u><u>3</u><u>2</u><u>.</u><u>7</u><u>5</u>

$\dashrightarrow{ \tt{mean = \frac{ \sum f(n)}{n} }} \\$

• f(n) are the values of the set

• n is the number of items

$\dashrightarrow \: { \tt{mean = \frac{ - 78 + ( - 12) + 3 + ( - 44)}{4} }} \\ \\ \dashrightarrow \: { \tt{ \frac{ - 131}{4} }} \\ \\ \dashrightarrow \: { \boxed{ \tt{mean = - 32.75}}}$

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3 years ago