Customers of the Key Refining Company Charge an Average of $70

question 63

Multiple Choice

Customers of the Key Refining Company charge an average of $70 per month. The distribution of amounts charged is approximately normal,with a standard deviation of $10. What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?

• A)0.1962
• B)0.4032
• C)0.3413
• D)0.4750

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