And c. Compute the expected income u of a super shopper.D. Compute the standard deviation o for the income of super shoppers

$/2020 Homework Week 4 (ADA) - MATH120 Fall 2020 Session B, section B005, Fall 2020 | WebAssign 3. [-/8.33 Points] DETAILS BBBASICSTAT8ACC 6.1.011. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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% 15% 21% 17% 20% 6% (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 1. Yes. The events are distinct and the probabilities sum to 1. O Yes. The events are distinct and the probabilities do not sum to 1. O Yes. The events are indistinct and the probabilities sum to less than 1