QUESTION 18 The service time for customers coming through a checkout counter has mean 50 seconds and standard deviation 6.8 seconds. Find the probability that the average service time for 64 passengers to get service will be between 48.4 and 51.6 seconds. 0.1897 0.9699 0.9399

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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QUESTION 18
The service time for customers coming through a checkout counter has mean 50 seconds and standard deviation 6.8
seconds. Find the probability that the average service time for 64 passengers to get service will be between 48.4 and 51.6
seconds.
0.1897
0.9699
0.9399
0.0301
QUESTION 19
A research worker wants to determine the average time it takes a mechanic to rotate the tires of a car, and she wants to be
able to assert with 95% confidence that the mean of her sample is off by at most 0.3 minutes. If she can presume from past
experience that the actual time follows normal distribution with a standard deviation of 1.5 minutes, how large the sample
will she have to take?
96
Sav
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Transcribed Image Text:QUESTION 18 The service time for customers coming through a checkout counter has mean 50 seconds and standard deviation 6.8 seconds. Find the probability that the average service time for 64 passengers to get service will be between 48.4 and 51.6 seconds. 0.1897 0.9699 0.9399 0.0301 QUESTION 19 A research worker wants to determine the average time it takes a mechanic to rotate the tires of a car, and she wants to be able to assert with 95% confidence that the mean of her sample is off by at most 0.3 minutes. If she can presume from past experience that the actual time follows normal distribution with a standard deviation of 1.5 minutes, how large the sample will she have to take? 96 Sav Click Save and Submit to save and submit. Click Save All Answers to save all answers.
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