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2. To estimate the number of calories in a cup of Beef Chao Fan, the number of calories in a sample of fifteen (15) separate cups of rice and meat is measured. The sample mean is 610.50 calories with sample standard deviation 28.90 calorie. Assuming the caloric content of all beef chao fan meal is normally distributed: a. Construct an 80% confidence interval for the mean number of calories of Beef Chao Fan meal. b. Construct a 90% confidence interval for the mean number of calories of Beef Chao Fan meal. c. Construct a 99% confidence interval for the mean number of calories of Beef Chao Fan meal