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The weight of a product is normally distributed with a mean of four ounces and a variance of 0.25 "squared ounces".

(a) What is the probability that a randomly selected unit from a recently manufactured batch weibghs more than 3.75 ounces?

(b) What is the probability that an average of 16 of these products weighs more than 4.5 ounces?

 

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