The Mean Life of Pair of Shoes Is 40 Months

question 87

Multiple Choice

The mean life of pair of shoes is 40 months with a standard deviation of 8 months.If the life of the shoes is normally distributed,how many pairs of shoes out of one million will need replacement before 36 months?

• A)500,000
• B)808,500
• C)191,500
• D)308,500

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