The lifetime T (in years) for a particular type of electric toothbrush is assumed to have the probability density f given by t f(t) = 3 18 0 ≤ t ≤6 otherwise.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The lifetime T (in years) for a particular type of electric toothbrush is assumed to have the
probability density f given by
t
0 ≤ t ≤6
f(t) =
{+
3
18
otherwise.
Transcribed Image Text:The lifetime T (in years) for a particular type of electric toothbrush is assumed to have the probability density f given by t 0 ≤ t ≤6 f(t) = {+ 3 18 otherwise.
(c) What is the probability that the average lifespan of T for 90 independent toothbrushes
is greater than 2.1 years?
Transcribed Image Text:(c) What is the probability that the average lifespan of T for 90 independent toothbrushes is greater than 2.1 years?
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