a) Compute and interpret the (approximate) mean percentage of family income allocated to grocery purchase.(6) b) compute the standard deviation of the percentage family income allocated to grocery(12) c) calculate the coefficient of variation(2)

A student from economics department conducted a study to identify the percentage of family income allocated to the purchase of groceries. She surveyed a random sample of 60 families and compiled the following numeric frequency distribution: Percentage family income Number of families 10 -20% 20 - 30% 14 30 40% 16 40 - 50% 12 50 -60% 4 60 - 70%