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assume that the heights of men are normally distributed with a mean of 68.4 inches and a standard deviation of 2.8 inches.if 64 men are randomly selected, find the probability that they have a mean height greater than 69.4 inches

if the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female.use the normal distribution to approximate the binomial distribution