AI Tutor
Back to 7.3 Using the Central Limit Theorem

7.3 Exercise 57

Avg difficulty 2.5


For each problem, wherever possible, provide graphs and use the calculator.

Your company has a contract to perform preventive maintenance on thousands of air-conditioners in a large city. Based on service records from previous years, the time that a technician spends servicing a unit averages one hour with a standard deviation of one hour. In the coming week, your company will service a simple random sample of 70 units in the city. You plan to budget an average of 1.1 hours per technician to complete the work. Will this be enough time?

OpenStax Introductory Statistics 2e, 7.3 Using the Central Limit Theorem, exercise 57

AI Tutor

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