Lemma
EasyContinuous distributions
OpenStax, Statistics §5.3 The Exponential Distribution (Optional) · Try It 2 · Probability · Continuous distributions

The Exponential Distribution (Optional) · Try It 2

The number of days ahead travelers purchase their airline tickets can be modeled by an exponential distribution with the average amount of time equal to 15 days. Find the probability that a traveler will purchase a ticket fewer than 10 days in advance. How many days do half of all travelers wait?

~5 minWritten answer · compare with the solution

OpenStax, Statistics · §5.3 The Exponential Distribution (Optional) · Try It 2

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.