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Back to 7.2 The Central Limit Theorem for Sums

7.2 Exercise 31

Avg difficulty 2.5


Use the following information to answer the next three exercises. A market researcher analyzes how many electronics devices customers buy in a single purchase. The distribution has a mean of three with a standard deviation of 0.7. They sample 400 customers.

What is the z-score for Σx = 840?

OpenStax Introductory Statistics 2e, 7.2 The Central Limit Theorem for Sums, exercise 31

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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.