SOLUTION: Please help me with this homework problem. The previous answer (.1057) was incorrect. Suppose the life of a certain brand of vacuum cleaner is normally distributed with a mean l

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Question 445402: Please help me with this homework problem. The previous answer (.1057) was incorrect.
Suppose the life of a certain brand of vacuum cleaner is normally distributed with a mean life of 12 years and a standard deviation of 4 years. A vacuum cleaner is randomly chosen.
7. Find the probability that it will last less than 10 years (4 digits after decimal point).
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi

 z = (-12)/4 = .5   P(z< .5) = .3085 

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