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Income Range Midpoint x Percent of super shoppers 5-15 10 21% 15-25 20 14% 25-35 30...

Income Range Midpoint x Percent of super shoppers
5-15 10 21%
15-25 20 14%
25-35 30 22%
35-45 40 15%
45-55 50 20%
55 or more 60 8%

  1. (a) Using the income midpoints x and the percent of super shoppers, do we have a valid probability distribution? Explain.

  2. (b) Use a histogram to graph the probability distribution of part (a).

  3. (c) Compute the expected income m of a super shopper.

  4. (d) Compute the standard deviation s for the income of super shoppers.

Math   Statistics-And-Probability   
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