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let x be the weight of a randomly selected man it is known that x is normally distributed and x has the the mean of

let x be the weight of a randomly selected man it is known that x is normally distributed and x has the the mean of 78 kg (kilograms) and the standard deviation of 13 kg find each of the following (a) let x be the random variable measuring the sample mean weight of 30 randomly selected men is the random variable x normally distributed why (b) find the mean and the standard deviation of x (c) find the probability that randomly selected 30 men have an average weight greater than 75 kg (d) interpre

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