A dealer's recent records of 80 truck sales provided the following frequency information on size of truck and type of drive.

(a) Determine the marginal totals.
(b) Obtain the table of relative frequencies.
(c) Calculate the relative frequencies separately for each row.
(d) Does there appear to be a difference in the choice of drive for purchasers of small- and full-size trucks?

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2-Wheel Drive 4-Wheel Drive Truck Size Small Full 12 20 23 25