OpenStax, Introductory Business Statistics 2e §5.3 The Exponential Distribution · Exercise 33 · Probability · Continuous distributions
The Exponential Distribution · Exercise 33
The average lifetime of a certain new smartphone is three years. The manufacturer will replace any smartphone failing within two years of the date of purchase. The lifetime of these smartphone is known to follow an exponential distribution.
What is the probability that a smartphones will fail within two years of the date of purchase?
(a) 0.8647
(b) 0.4866
(c) 0.2212
(d) 0.9997
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Business Statistics 2e · §5.3 The Exponential Distribution · Exercise 33
Stuck? A gentle nudge
No hints for this one.
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.