MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

15

The mean time for a group of adults to complete a certain achievement test is 38.8 minutes and the standard deviation is 7 minutes. Assume the variable is normally distributed, find the probability that if 35 randomly selected adults take the test their mean time to complete the test will be less than 40 minutes. Is this an unusual event? O 0.1552, yes, it is unusual because the probability is smaller than 5%. O 0.4319, yes, it is unusual because the probability is smaller than 5%. O 0.5681, no, it is not unusual since it is larger than 5%. O 0.8448, no, it is not unusual since the probability is larger than 5%.
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Transcribed Image Text:The mean time for a group of adults to complete a certain achievement test is 38.8 minutes and the standard deviation is 7 minutes. Assume the variable is normally distributed, find the probability that if 35 randomly selected adults take the test their mean time to complete the test will be less than 40 minutes. Is this an unusual event? O 0.1552, yes, it is unusual because the probability is smaller than 5%. O 0.4319, yes, it is unusual because the probability is smaller than 5%. O 0.5681, no, it is not unusual since it is larger than 5%. O 0.8448, no, it is not unusual since the probability is larger than 5%.
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