8. The FDA is comparing the mean ea feine contents of two brands of cola. Independent random samples of 6-oz. cans ofHeach brand were selected and the caffeine content of each can determined. The study provided the following summaryinformation.Brand A Brand BSample size20Variance 1.2How many cans of each soda would need to be sampled in order to estimate the difference in the mean caffeine content towithin 10 with 90% reliability?