Q.1 Suppose samples are taken from a population of heifers with known mean and variance of weight gains of 188 lbs. and 2200 square lbs., respectively. a) What are the mean and the variance of an average weight gain estimated from a sample of 20 heifers? (188,110) b) What are the mean and variance from a sample of 30 heifers? (188, 73.3) c) How many heifers should be in a sample in order for the variance of sample means to equal 50? (44)

Q: Ques 3 ,4 and 5

A: This is a basic problem of central tendency . It is very useful.

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