Answered: A student took two national aptitude…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

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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