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a normal population has a mean of 20.0 and a standard deviation of 4.0. (show the calculation)a) compute the Z value associated with 25b) what proportion of the population is between 20.0 and 25.0?c) what proportion of the population is less than 18.0?17. a normal distribution has a mean of 50 and a standard deviation of 4.a) compute the probability of a value between 44.0 and 55.0b) compute the probability of a value greater than 55.0c) computer the probability of a value between 52.0 and 55.0
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