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Back to 7.2 The Central Limit Theorem for Sums

7.2 Exercise 15

Avg difficulty 2.5


Use the following information to answer the next five exercises: The distribution of results from a cholesterol test has a mean of 180 and a standard deviation of 20. A sample size of 40 is drawn randomly.

Find the percentage of sums between 1.5 standard deviations below the mean of the sums and one standard deviation above the mean of the sums.

OpenStax Introductory Statistics 2e, 7.2 The Central Limit Theorem for Sums, exercise 15

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Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.