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23 February, 18:40

In a recent study of animal sleep times at the zoo, the mean amount of sleep per night is 6.3 hours with a standard deviation of 2.1. If 23 animals are selected, find the probability that the mean sleep time per night is greater than 8 hours.

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  1. 23 February, 18:49
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    z = (8-6.3) / 2.1

    z = 0.8

    probability that the mean sleep time per night is greater than 8 hours is 0.8
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