What is the income distribution of super shoppers? A supermarket super shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon. In the following table, income units are in thousands of dollars, and each interval goes up to but does not include the given high value. The midpoints are given to the nearest thousand dollars. 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% 20% 17% 19% 9% a) Using the income midpoints x and the percent of super shoppers, do we have a valid probability distribution? Explain. O No. The events are indistinct and the probabilities sum to more than 1. Yes. The events are babilities do not sum to 1. Yes. The eve lities sum to 1. No. The events are indistinct and the probabilities sum to 1. Yes. The events are indistinct and the probabilities sum to less than 1.(b) Use a histogram to graph the probability distribution of part (a). (Select the correct graph.) 25 [ 20 15 TTTTTTTTTTTT TTTTTTTTTTTT % Supr Shpprs 10 20 30 40 50 60 O Income 25 TTTT TTT TTTTTTTTT TTT TTT TTT % Supr Shpprs 10 10 20 30 40 50 60 Income 25 TTTTTTT TTTTTT TTT TTT TTT TTT % Supr Shpprs 10 10 20 30 40 50 60 Income TTTTTTTTTTTTTTTTTT TTTTTT % Supr Shpprs 10 20 30 40 50 60 O Income(c) Compute the expected incomey. ofa super shopper [in thousands ofdollars). {Enter a number. Round your answer to two decimal places.) p = \\:| thousands of dollars (:1) Compute the standard deviation 0 for the income of super shoppers (in thousands of dollars). (Enter a number. Round your answer to two decimal places.) a' = \\:| thousands of dollars