SOLUTION: The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month. The distribution of amounts spent is approximately normal with a standar

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Question 296750: The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month. The distribution of amounts spent is approximately normal with a standard deviation of $11. What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?

Found 2 solutions by northstar721, fineboyus:
Answer by northstar721(1) About Me  (Show Source):
Answer by fineboyus(1) About Me  (Show Source):