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3 years ago

What is d = -12t + 96 ?

Mathematics

1 answer:

lbvjy [14]3 years ago

4 0

Answer:

t = 8 - 1/12d

Step-by-step explanation:

tell me if this is wrong

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Mr. Good Wrench advertises that a customer will have to wait no more than 30 minutes for an oil change. A sample of 26 oil chang

Andru [333]

Answer:

The 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).

Step-by-step explanation:

The (1 - α)% confidence interval for the population standard deviation is:

$CI=\sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{\alpha/2, (n-1)}}}\leq \sigma\leq \sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{1-\alpha/2, (n-1)}}}$

The information provided is:

n = 26

s = 4.8 minutes

Confidence level = 90%

Compute the critical values of Chi-square as follows:

$\chi^{2}_{\alpha/2, (n-1)}=\chi^{2}_{0.10/2, (26-1)}=\chi^{2}_{0.05, 25}=37.652$

$\chi^{2}_{1-\alpha/2, (n-1)}=\chi^{2}_{1-0.10/2, (26-1)}=\chi^{2}_{0.95, 25}=14.611$

*Use a Chi-square table.

Compute the 90% confidence interval for the population standard deviation waiting time for an oil change as follows:

$CI=\sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{\alpha/2, (n-1)}}}\leq \sigma\leq \sqrt{\frac{(n-1)s^{2}}{\chi^{2}_{1-\alpha/2, (n-1)}}}$

$=\sqrt{\frac{(26-1)\times 4.8^{2}}{37.652}}\leq \sigma\leq \sqrt{\frac{(26-1)\times 4.8^{2}}{14.611}}\\\\=3.9113\leq \sigma\leq 6.2787\\\\\approx 3.9 \leq \sigma\leq6.3$

Thus, the 90% confidence interval for the population standard deviation waiting time for an oil change is (3.9, 6.3).

3 0

3 years ago

Solve the open sentence. –2 ≤ n + 4 ≤ 7

bekas [8.4K]

The answer is n ≥ –6 and n ≤ 3 .hope this helps

6 0

3 years ago

Read 2 more answers

I'M CLOSE TO BE DONEEEEEEEEE! HELP MEH! IF YOU'RE CORRECT YOU'LL GET BRAINLIEST!

Dvinal [7]

Answer:

mhm es la escuela media o secundaria? te puedo ayudar

3 0

3 years ago

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A worker has four different job offers, each with a contract for seven years. Assuming the job descriptions are identical, which

algol [13]

Answer:

The least attractive offer is the fourth case a starting salary of $105,000 with a 4% increase each year

Step-by-step explanation:

I attach the full question below

This question can be modeled as a geometric sequence over seven years

Formula

and the general formula will be:

R = k[(1+i)^n - 1]/i

Where

i represents the increase in percentage annualy,

n the number of years

k the initial amount at the start of the period

First case

(125,000)(1.02^7 - 1)/0.02 = $929,285.4

Second case

(110,000)(1.03^7 - 1)/0.03 = $842,870.8

Third case

(98,000)(1.08^7 - 1)/0.08 = $874,434.7

Fourth case

(105,000)(1.04^7 - 1)/0.04 = $829,320.9

The least attractive offer is the fourth case a starting salary of $105,000 with a 4% increase each year

6 0

3 years ago

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Pete works as a door to door vacuum salesman and earns a base salary of $400 per week plus 8% commission on

ololo11 [35]

Answer:

$516.48

Step-by-step explanation:

Base salary is what Pete will be paid whether he makes a sale or not.

Sales commission is the percentage of the value of the sale that Pete makes which is added to his base salary.

Base salary = $400

Total sales last week = $1456

Commission = 8% of total sales

Commission of last week = 8% of $1456

= 0.08*1456 = $116.48

Gross salary = base salary + commission

= 400 + 116.48

= $516.48

5 0

3 years ago