A study conducted by a consumer association showed that thelifespan of a phone is a normally distributed random variable with a mean of 7.1 years and a standard deviation of 1.4 years.1) What is the probability that the life of a player is greater than 5 years and less than 8 years? 2)Beyond what duration do 90% of phones “die” according to their study?

A study conducted by a consumer association showed that thelifespan of a phone is a normally distributed random variable with a mean of 7.1 years and a standard deviation of 1.4 years.1) What is the probability that the life of a player is greater than 5 years and less than 8 years? 2)Beyond what duration do 90% of phones “die” according to their study?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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