The length of a Colorado brook trout is normally distributed. (a) What is the probability that a

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The length of a Colorado brook trout is normally distributed.
(a) What is the probability that a brook trout's length exceeds the mean?
(b) Exceeds the mean by at least 1 standard deviation?
(c) Exceeds the mean by at least 2 standard deviations?
(d) Is within 2 standard deviations?
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