What is the probability of a sample mean between 20 and 22

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Australian koala bears are thought to have a mean height of 21 inches and a standard deviation of 3 inches. You plan to choose a sample of 55 bears at random. What is the probability of a sample mean between 20 and 22? How many bears in the sample are likely to be taller then 25 inches?

Reference no: EM13612015

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