It is positively skewed O It is approximately symmetric O It is negatively skewe

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It is positively skewed O It is approximately symmetric O It is negatively skewed 5. 112 points I Previous PODStat5 4.E.039 My Note In a study investigating the effect of car sptied on accident severity, 5000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was rec one. For these 5000 accidents, the average speed was 44 mph and that the standard deviation was 17 mph. A histogram revealed that the vehicle speed at impact dist approximately normal (a) Roughly what proportion of vehicle speeds were between 27 and 61 mph? (Round the answer to the nearest whole number.) Approximately 68 (b) Roughly what proportion of vehicle speeds exceeded 61 mph? (Round the answer to the nearest whole number. Approximately 95 Need Help? ReadItTalk to a Tutor A student took two national aptitude tests. The national average and standard deviation were 525 arn The student scored 725 on the first test and 50 on the second test. Use z scores to d e and standard deviation were 525 and 100, respectively, for the first test and 40 and 10, respectively, for t ine on which exam the student performed better relative to the other test takers eterm t 0 Type here to search 5

Explanation / Answer

= 44

= 17

b) P(X > 61) = P(Z > (61-44)/17)

                     = P(Z > 1)

                     = (100-68)/2 %

                     = 16%

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