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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%.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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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%.
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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