A student took two national aptitude tests. The national mean and standard deviation were 375 and 100, respectively, for the first test, and 50 and 8, respectively, for the second test. The student scored 525 on the first test and 70 on the second test. Use z-scores to determine on which exam the student performed better relative to the other test takers. first exam or second exam 2. In a study investigating the effect of car speed on accident severity, 5,000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5,000 accidents, the average speed was 41 mph and the standard deviation was 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal. (Use the Empirical Rule.) Approximately what percentage of these vehicle speeds exceeded 56 mph? (Round your answer to the nearest whole number.) approximately__ %
A student took two national aptitude tests. The national mean and standard deviation were 375 and 100, respectively, for the first test, and 50 and 8, respectively, for the second test. The student scored 525 on the first test and 70 on the second test. Use z-scores to determine on which exam the student performed better relative to the other test takers. first exam or second exam 2. In a study investigating the effect of car speed on accident severity, 5,000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5,000 accidents, the average speed was 41 mph and the standard deviation was 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal. (Use the Empirical Rule.) Approximately what percentage of these vehicle speeds exceeded 56 mph? (Round your answer to the nearest whole number.) approximately__ %
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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1. A student took two national aptitude tests. The national mean and standard deviation were 375 and 100, respectively, for the first test, and 50 and 8, respectively, for the second test. The student scored 525 on the first test and 70 on the second test. Use z-scores to determine on which exam the student performed better relative to the other test takers.
first exam or
second exam
2. In a study investigating the effect of car speed on accident severity, 5,000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5,000 accidents, the average speed was 41 mph and the standard deviation was 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal. (Use the Empirical Rule .)
Approximately what percentage of these vehicle speeds exceeded 56 mph? (Round your answer to the nearest whole number.)
approximately__ %
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