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