Life Expectancy of Shoes Records show that the average life expectancy of a pair of
Chapter 9, Problem 34(choose chapter or problem)
Life Expectancy of Shoes Records show that the average life expectancy of a pair of shoes is 2.2 years with a standard deviation of 1.7 years. A manufacturer guarantees that shoes lasting less than a year are replaced free. For every 1000 pairs sold, how many pairs should the manufacturer expect to replace free? Assume a normal distribution
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