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. T
he 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? 0.3085 0.6915 It cannot be determined from the information given. Correct: Your answer is correct. (b) What is the probability that the average time of two randomly-selected customers will take less than 3 minutes? 0.7611 0.2389 It cannot be determined from the information given. Correct: Your answer is correct. (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
1 answer:
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