although most of us buy milk by the quart or gallon, farmers measure daily production in pounds. ayrshire cows average 47 pounds of milk a day, with a standard deviation of 6 pounds. for jersey cows, the mean daily production is 43 pounds, with a standard deviation of 5 pounds. assume that normal models describe milk production for these breeds. a) if we select an ayrshire at random, what's the probability that she averages more than 50 pounds of milk a day? b) a farmer has 20 jerseys. what's the probability that the average production for this small herd exceeds 45 pounds of milk a day? c) a farmer has 20 ayrshires. there's a 99% chance each day that this small herd produces at least how many pounds of milk?