The mean checkout time in the express lane of a large grocery store is 2.7 minutes, and the standard deviation is 0.6 minutes. The distribution of checkout times is non-normal (for one thing, it can be a lot longer than 2.7 minutes, but it can only be so short). (a) What is the probability that a randomly-selected customer will take less than 3 minutes? 0.69150.3085     It cannot be determined from the information given. (b) What is the probability that the average time of two randomly-selected customers will take less than 3 minutes? It cannot be determined from the information given.0.2389     0.7611 (c) The probability that the average time of 64 randomly-selected customers will take less than 2.8 minutes is

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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The mean checkout time in the express lane of a large grocery store is 2.7 minutes, and the standard deviation is 0.6 minutes. The distribution of checkout times is non-normal (for one thing, it can be a lot longer than 2.7 minutes, but it can only be so short).
(a) What is the probability that a randomly-selected customer will take less than 3 minutes?

0.69150.3085     It cannot be determined from the information given.

(b) What is the probability that the average time of two randomly-selected customers will take less than 3 minutes?

It cannot be determined from the information given.0.2389     0.7611


(c) The probability that the average time of 64 randomly-selected customers will take less than 2.8 minutes is

(d) The probability that the average time of 81 randomly-selected customers will take less than 2.8 minutes is

(e) The probability that the average time of 225 randomly-selected customers will take less than 2.8 minutes is

(f) The probability that the average time of 400 randomly-selected customers will take less than 2.8 minutes is  

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