OpenStax, Statistics §7.3 Using the Central Limit Theorem · Exercise 15 · Statistics · Sampling distributions

Using the Central Limit Theorem · Exercise 15

The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.

Find the probability that the sample mean is between 7 and 11.

~8 minWritten answer · compare with the solution

OpenStax, Statistics · §7.3 Using the Central Limit Theorem · Exercise 15

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.