The mean annual income for people in a certain city (in thousands of dollars) is 42, with

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The mean annual income for people in a certain city (in thousands of dollars) is 42, with a standard deviation of 30.

A pollster draws a sample of 90 people to interview.

a. What is the probability that the sample mean income is less than 38?

b. What is the probability that the sample mean income is between 40 and 45?

c. Find the 60th percentile of the sample mean.

d. Would it be unusual for the sample mean to be less than 35?

e. Can you tell whether it would be unusual for an individual to have an income less than 35? Explain.

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Elementary Statistics

ISBN: 9781259969454

3rd Edition

Authors: William Navidi, Barry Monk

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Question Posted: May 06, 2024 12:00 PM

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The mean annual income for people in a certain city (in thousands of dollars) is 42, with

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Elementary Statistics

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