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OpenStudy (orb):
Based on weighting the most animals in the population, the American Angus Association reported that mature Angus cows had a mean weight of 1309 pounds with a standard deviation of 157 pounds. A research randomly measures 100 mature Angus cows. Find out the probability that: a) the average weight of the 100 mature Angus cows is greater than 1320 pounds b) the average weight of the 100 mature Angus cows is between 1290 and 1310.
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