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Assume that women's weights are normally distributed with a mean given by ?=143μ=143 lb and a...

Assume that women's weights are normally distributed with a mean given by ?=143μ=143 lb and a standard deviation given by ?=29σ=29 lb.
(a)  If 1 woman is randomly selected, find the probabity that her weight is between 113113 lb and 172172 lb

(b)  If 44 women are randomly selected, find the probability that they have a mean weight between 113113 lb and 172172 lb

(c)  If 5151 women are randomly selected, find the probability that they have a mean weight between 113113 lb and 172172 lb

Math   Statistics-And-Probability   
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