Question 2: A feed supply company has developed a special feed supplement to see if it will promote weight gain in livestock. If the standard deviation of cows' weight gain for the entire herd composed of 2000 cows is 7 with a mean of 60 pounds. The company researchers reported that the 81 selected cows studied gained an average of 56 pounds. A. Can it be reasonably regarded that the sample collected by researchers is from a population of mean 60 pounds gain in weight with standard deviation of 7 pounds at a=0.05 and a=0.01? B. Find the 95% and 99% confidence limits for the mean. C. Give the number of cows gained less than 54 pounds in the population. D. Give the number of cows gained more than 61 pounds in the population. E. Give the number of cows gained weight between 55 and 62 pounds in the population