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

Algebra ->  Probability-and-statistics -> 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      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

 z = (highlight%2810%29-12)/4 = .5   P(z< .5) = .3085