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 unusu 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%.
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 unusu 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%.
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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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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