A certain brand of batteries has a lifetime that has a normal distribution with a mean of 50 hours and a standard deviation of 7 hours. What proportion of these batteries will last for more than 57 hours? You are told that P (Z < 1) = 0.84

A certain brand of batteries has a lifetime that has a normal distribution with a mean of 50 hours and a standard deviation of 7 hours. What proportion of these batteries will last for more than 57 hours? You are told that P (Z < 1) = 0.84

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

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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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.

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Transcribed Image Text:QUESTION 34 A certain brand of batteries has a lifetime that has a normal distribution with a mean of 50 hours and a standard deviation of 7 hours. What proportion of these batteries will last for more than 57 hours? You are told that P (Z < 1) = 0.84 %3D 84% 68% 16% O 34%

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