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16. The following is a frequency distribution of the monthly expenditures for gasoline of 400 households in Chattanooga. Class Expenditure ($) # of households 0 and under 20 84 20 and under 40 128 W N 40 and under 60 68 60 and under 80 56 80 and under 100 40 6 100 and over 24 What is the cumulative relative frequency of the 3rd class? a. .17 b. 53 C. .66 d. .70