Income range	5-15	15-25	25-35	35-45	45-55	55 or more
Midpoint x	10	20	30	40	50	60
Percent of super shoppers	22%	13%	22%	17%	18%	8%

(c)Compute the expected income of a super shopper (in thousands of dollars). (Enter a number. Round your answer to two decimal places.) = _________ thousands of dollars (d)Compute the standard deviation for the income of super shoppers (in thousands of dollars). (Enter a number. Round your answer to two decimal places.) = __________ thousands of dollars