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Course 35815

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Crossett Truck Rental has a large fleet of rental trucks. At times many of the trucks need substantial repairs. Mr. Crossett has requested a study of the repair cost. A random sample of 19 trucks is selected and the average annual repair cost is $ 690, with the standard deviation of $ 96. Give the upper limit of the 93 percent confidence interval for the mean annual repair cost of all the trucks.

Show 2 decimal places and use period (.) as a separator (like: 0.46).

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Crossett Truck Rental has a large fleet of rental trucks. At times many of the trucks need substantial repairs. Mr. Crossett has requested a study of the repair cost. A random sample of 28 trucks is selected and the average annual repair cost is $ 530, with the standard deviation of $ 123. Give the upper limit of the 96 percent confidence interval for the mean annual repair cost of all the trucks.

Show 2 decimal places and use period (.) as a separator (like: 0.46).

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A recent article in the Cincinnati Enquirer reported that the mean cost

to repair a heat pump is $132 with a standard deviation of $28.

What is the probability that the repair cost of a heat pump

will be between $144 and $158?

(use five decimal places, for example: 0.23146)

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The probability that a standard normal random variable will

have a value less than or equal to 2.57 is:

(use five decimal places, for example: 0.23146)

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The amounts dispensed by a Coca-Cola machine follow the normal distribution

with a mean of 7.5 ounces and a standard deviation of 0.20 ounces per cup.

At least how much cola is dispensed in 26% of the largest cups?

(use two decimal places, for example: 6.23)

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A recent article in the Cincinnati Enquirer reported that the mean cost

to repair a heat pump is $150 with a standard deviation of $35.

What is the probability that the repair cost of a heat pump

will be more than $181?

(use five decimal places, for example: 0.23146)

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The amounts dispensed by a Coca-Cola machine follow the normal distribution

with a mean of 7.5 ounces and a standard deviation of 0.20 ounces per cup.

At most how much cola is dispensed in 31% of the smallest cups?

(use two decimal places, for example: 6.23)

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The probability that a standard normal random variable will

have a value less than or equal to 1.25 is:

(use five decimal places, for example: 0.23146)

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In a given area, the probability that person is exposed to an advertisement of a paper company is 0.05.

If 10 people are randomly chosen from among the population in the area, the probability that

at least 4 of them were exposed to the advertisement is (use four decimal places, like: 1.2378):

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The world's tea producers have in recent months planned and begun to implement a major advertising campaign in Europe to get people to drink more tea.

The monthly figures for their tea imports into Europe (in thousands of pounds) between February and May 2020 are as follows:

4, 4, 7, 11.

Estimate the linear trend equation and give the value of the intercept.

Show the result with one decimal place (like 2.6).

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