Question

In: Statistics and Probability

Watch your cholesterol: The mean serum cholesterol level for U.S. adults was 204, with a standard...

Watch your cholesterol: The mean serum cholesterol level for U.S. adults was 204, with a standard deviation of 42.5
(the units are milligrams per deciliter). A simple random sample of 112 adults is chosen. Use the TI-84 calculator.
Round the answers to four decimal places.

Part 1 of 3
What is the probability that the sample mean cholesterol level is greater than 212?
The probability that the sample mean cholesterol level is greater than 212 is?

Part 2 of 3
What is the probability that the sample mean cholesterol level is between 192 and 202?
The probability that the sample mean cholesterol level is between 192 and 202 is?

Part 3 of 3
Would it be unusual for the sample mean to be less than 197?
It (would/wouldnt) be unusual for the sample mean to be less than 197, since the probability is?

Solutions

Expert Solution

Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(1.9921, TRUE)" to find the probability.

The probability that the sample mean cholesterol level is greater than 212 is

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Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(-0.4980, TRUE)" & "=NORM.S.DIST(-2.9881, TRUE)" to find the probability.

The probability that the sample mean cholesterol level is between 192 and 202 is

---------------------------------------------------------------------------------------------------------------------

Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(-1.7431, TRUE)" to find the probability.

It be unusual for the sample mean to be less than 197, since the probability is

orchestra answered 1 year ago

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