The lifetime T (this year) for a particular type of electric toothbrush is assumed to have the probability density f given by 1 t 0 < + < 6

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
6th Edition
ISBN:9781337111348
Author:Bruce Crauder, Benny Evans, Alan Noell
Publisher:Bruce Crauder, Benny Evans, Alan Noell
Chapter1: Functions
Section1.2: Functions Given By Tables
Problem 32SBE: Does a Limiting Value Occur? A rocket ship is flying away from Earth at a constant velocity, and it...
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The lifetime T (this year) 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.
Transcribed Image Text:The lifetime T (this year) 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.
(c) What is the probability that the average lifespan of barT for 90 independent toothbrushes
is greater than 2.1 years?
Transcribed Image Text:(c) What is the probability that the average lifespan of barT for 90 independent toothbrushes is greater than 2.1 years?
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