Please help me compute the standard deviation! What is the income distribution of super shoppers. 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 midpoint are given to the nearest thousand dollars. income range: 5-15, 15-25, 25-35, 35-45, 45-55, 55 or more. next line is midpoint x: 10, 20, 30, 40, 50, 60. last line is percent of super shoppers: 21%, 14%, 22%, 15%, 20%, 8%. part (d): compute the standard deviation