OpenStax, Statistics §7.3 Using the Central Limit Theorem · Exercise 44 · Statistics · Sampling distributions

Using the Central Limit Theorem · Exercise 44

For each problem, wherever possible, provide graphs and use a 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?

~8 minWritten answer · compare with the solution

OpenStax, Statistics · §7.3 Using the Central Limit Theorem · Exercise 44

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your working

Check your full solution

Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.