(c) Find the median Thirty automobiles were tested for fuel efficiency in miles per gallon. Class boundaries 7.5-12.5 Frequency 3 12.5-17.5 5 17.5-22.5 15 22.5-27.5 27.5-32.5 S 2 Cumulative Frequency [3] (d) The mean of the number of sales of cars over a 3-month period is 87, and the standard deviation is 5. The mean of the commissions is $5225, and the standard deviation is $773. Calculate the coefficient of variations of the sales and commissions. [2]