A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.5 years, and a standard deviation of 0.5 years.  If you randomly purchase one item, what is the probability it will last longer than 9 years? Write your answer as a decimal using the appropriate rounding rul

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter11: Data Analysis And Displays
Section: Chapter Questions
Problem 5CR
Question

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.5 years, and a standard deviation of 0.5 years.  If you randomly purchase one item, what is the probability it will last longer than 9 years? Write your answer as a decimal using the appropriate rounding rule.

 

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