Question

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 21% 14% 21% 17% 20% 7%

(a) Using the income midpoints x and the percent of super shoppers, do we have a valid probability distribution? Explain. No. The events are indistinct and the probabilities sum to more than 1. Yes. The events are distinct and the probabilities sum to 1. No. The events are indistinct and the probabilities sum to 1. Yes. The events are distinct and the probabilities do not 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.)

(c) Compute the expected income μ of a super shopper (in thousands of dollars). (Enter a number. Round your answer to two decimal places.)
μ =  thousands of dollars

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

10. a 3 My Nates Ask Your Teacher ns purchased were on sale or purchased with a coupon. In the following table, income units are in thousands -/6.25 points BBBasicStat&Acc 6.1.011. Startse it e Pro R e tina the safe m Income range 5-15 15-25 25-35 35-4545-55 55 or more Midpoint x 10 20 30 40 50 60 Percent of super shoppers 21% 141 211 1 7% 20% 74% (a) o the comidpaints and deperget Leyper 280RS, do we have a valid probability distribution? Explain. Yes. The events are distinct and the probabilities sum to 1. No. The events are indistinct and the probabilities sum to 1. Yes. The events are distinct and the probabilities do not surn 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 (e) (Select the correct graph.) (c) Compute the expected income of a super shopper (in thousands of dollars). (Enter a number. Round your answer to two decimal places.) I thousands of dollars (d) Compute the standard deviation o for the income of super shoppers (in thousands of dollars). (Enter a number. Round your answer to two decimal places.) thousands of dollars

Answer 1

let all. +49 +211 +17% +20% +7% = 100°)- Yes, the evenis are distinct and the probabeletres sum to b) X Income Mean u= Expex) u = 1000.21) + a01014) + 3000.20 + 40(0.17) + 50 (0.20) +6010-01) - ſele-wp(a) r= 10-32.2) 10.21) + ... + (60-32.2) (087) (103.496+ 201838 + 1.016+ 10.343 o + 63.368 + 54.099) 15:41