10. Consumption of alcoholic beverages by young people is of concern in the European countries. Annual consumption data (in litres) are shown below for a sample of 20 European young people. The summation of 20 ; = 2600 , the sample variance of the 20 samples is s =4276. Assuming the population the 20 samples is i=1 is distributed roughly symmetrically. a. Calculate the sample mean and sample standard deviation. (10 p) b. Construct a 95% confidence interval for the mean annual consumption of alcoholic beverages by young European. (10 p)