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2 years ago

Mr. Jones charged Roberta $32 for parts and $15 per hour for labor to repair her

Mathematics

1 answer:

Galina-37 [17]2 years ago

5 0

Answer:

Step-by-step explanation:

Since 3 hours and $15 an hour

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Suppose that time spent on hold per call with customer service at a large telecom company is normally distributed with a mean µ

lana66690 [7]

Answer:

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 8 minutes

Standard Deviation, σ = 2.5 minutes

Sample size, n = 25

We are given that the distribution of time spent is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling =

$=\dfrac{\sigma}{\sqrt{n}} = \dfrac{2.5}{\sqrt{25}} = 0.5$

P(sample mean is between 7.8 and 8.2 minutes)

$P(7.8 \leq x \leq 8.2)\\\\ = P(\displaystyle\frac{7.8 - 8}{0.5} \leq z \leq \displaystyle\frac{8.2-8}{0.5})\\\\ = P(-0.4 \leq z \leq 0.4})\\\\= P(z < 0.4) - P(z < -0.4)\\\\= 0.6554 -0.3446= 0.3108$

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.

4 0

3 years ago

I need answers , pls !!

jek_recluse [69]

Abcdefghijklmnopqrstuvwxyz

5 0

2 years ago

I NEED HELP PLEASEE

jonny [76]

Answer is 50%
640$ 100%
960$ X%
X=960•100/640
X=150%
150-100=50%

6 0

2 years ago

What is an equation for 7 more than a number is 10?

cupoosta [38]

Answer:

So, equation for 7 more than a number is 10 is $x+7=10$

Step-by-step explanation:

We need to write equation for 7 more than a number is 10.

For writing the equation, we first consider a number. Let the number be x

7 More than a number in mathematical form is translated as : $x+7$

So, equation for 7 more than a number is 10 is $x+7=10$

4 0

2 years ago

Read 2 more answers

A certain type of concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The strength of concrete

Sholpan [36]

Answer:

a) Mean = 3670

b) Median = 3830

c) Mode = 4090

Step-by-step explanation:

a) By mean, we imply the average of the sample collected. This is given by the formula:

Mean ( $\bar{x}$ ) = $\frac{\sum\limits_{i=1}^{n}{x}}{n}$ , where n is the sample size and x is the samples collected.

==> $\bar{x}$ = (2940+3100+3200+3780+3830+3960+4040+4090+4090 )/9

==> $\bar{x}$ = 33030/9 = 3670

b) By median, we imply middle value. Since the data size is small, we can easily sort the data in ascending or descending order. Then, we pick the middle value.

Sorted value => 2940 3100 3200 3780 3830 3960 4040 4090 4090

By formula, median = ((n+1)/2)th = 5th position value.

Therefore, the median = 3830

c) By mode, we imply the most occurrence value in the dataset. From the sorting: 2940 3100 3200 3780 3830 3960 4040 4090 4090 ,

The last two values occur most. Therefore, the mode is:

===> 4090

4 0

2 years ago