The Exponential Distribution (Optional) · Exercise 33
The average lifetime of a certain new cell phone is three years. The manufacturer will replace any cell phone failing within two years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution.
What is the probability that a phone 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, Statistics · §5.3 The Exponential Distribution (Optional) · Exercise 33
No hints for this one.
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