Question 11 of 20 Annual income: The mean annual income for people in a certain city (in thousands of dollars) is 40, with a standar deviation of 28. A pollster draws a sample of 90 people to interview. (a) What is the probability that the sample mean income is less than 35? (b) What is the probability that the sample mean income is between 38 and 46? th (c) Find the 40 percentile of the sample mean. (d) Would it be unusual for the sample mean to be less than 38? (e) Do you think it would be unusual for an individual to have an income of less than 38? Part 1 of 5
Question 11 of 20 Annual income: The mean annual income for people in a certain city (in thousands of dollars) is 40, with a standar deviation of 28. A pollster draws a sample of 90 people to interview. (a) What is the probability that the sample mean income is less than 35? (b) What is the probability that the sample mean income is between 38 and 46? th (c) Find the 40 percentile of the sample mean. (d) Would it be unusual for the sample mean to be less than 38? (e) Do you think it would be unusual for an individual to have an income of less than 38? Part 1 of 5
Chapter9: Sequences, Probability And Counting Theory
Section9.7: Probability
Problem 1SE: What term is used to express the likelihood of an event occurring? Are there restrictions on its...
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