The length of life X, in days, of a heavily used electric motor has probability density functionf(x) = {0,-3xS3ex20%3DotherwiseFind the probability that the motor has at least 1/2 of a day, given that it has lasted 1/4 of a day.Find the mean and the variance for X.

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Answered: The length of life X, in days, of a…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

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 length of life X, in days, of a heavily used electric motor has probability density function -3x X20 f(x) = {0, otherwise Find the probability that the motor has at least 1/2 of a day, given that it has lasted 1/4 of a day. Find the mean and the variance for X.