A quart of milk contains a mean of 26 g of butterfat, with a standard deviation of 2 g. If the butterfat is normally distributed, find the probability that a quart of this brand of milk chosen at random will contain the following. (Round your answers to four decimal places.) (a) between 26 and 30g of butterfat (b) between 21 and 26 g of butterfat

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