Save Question 9 (1.2 points) The GMAC Insurance company reported that the mean s

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Save Question 9 (1.2 points) The GMAC Insurance company reported that the mean score on the National Drivers Test was 76.6 with a standard deviation of 3.1 points. The test scores are approximately bell-shaped. Approximately 68% of all test scores were between two values A and B. Whht is the value of A? Write only a number as your answer. Round to one decimal place. Your Answer: Answer Save Question 10 (1.2 points) In a large sample of customer accounts, a utility company determined that the average number of days between when a bill was sent out and when the payment was made is 10 with a standard deviation of 20 days. Assume the data to be approximately bell-shaped. Approximately 95% of all customer accounts have the average number of days between two values A and B. What is the value of B? Write only a number as your answer Your Answer: Answer Save

Explanation / Answer

9) = 76.6

= 3.1

Approximately 68% of all test scores lie between +

Ao, A = - = 76.6 - 3.1 = 73.5

10) = 10

= 20

Approximately 95% of all test scores lie between + 2*

Ao, B = + 2* = 10 + 2*20 = 50

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