Question

Question 9(1.2 points) The GMAC Insurance company reported that the mean score on the National Drivers Test was 78.3 with a standard deviation of 2.6 points. The test scores are approximately bell-shaped. Approximately 68% of all test scores were between two values A and B. What is the value of A? Write only a number as your answer. Round to one decimal place. Your Answer: Answer 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 12 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 1

The GMAC insurance company reported that the mean score on National Driver Test was 78.3 with a standard deviation of 2.6 points. The test scores are approximately bell shaped.

Approximately 68% of the scores were between two values A and B. We need to find A.

For the second part it is given 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 12 days. The data is approximately bell shaped. 95% of all customer accounts have the average number of days between 2 values A and B. To find value of B

out art when to o 1 2 B-10 3-10

awh mean TR 3 an andand deviahon 2.6 Letrov eo1 d.ven lu>ナbe X 10 O 2-6 6 J 100 -78.3 uahue φ i.the cdf dfc N(A,) Taking B + 2.6 6 8 (00