The following cumulative relative frequency distribution summarizes data obtained in a study of the ending overages (in dollars) for the cash register balance at a business:

a. Determine the proportion of the days in which there were no shortages.
b. Determine the proportion of the days the cash register was less than $20 off.
c. Determine the proportion of the days the cash register was less than $40 over or at most $20 short.

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Cumulative Relative Relative Frequency Frequency requeney 0.04 0.04 0.16 0.32 0.40 004 Class 60.00-<-40.00 40.00-<-20.0) -20.00-00.00 00.00-< 20.00 20.00- 40.00 40.00 60.00 0.04 0.08 0.24 0.56 0.96 1.00 16 20