As part of a study on income tax compliance (Behavioral Research and Accounting, January 2015), researchers sampled 270 adults at a shopping mall and asked each: "Who usually prepares your tax return?" Their answers (and frequency of responses) are shown in the table (p. 146). Use the information in the table to estimate the probability that a randomly selected adult uses a friend, relative, or professional to prepare his or her income tax return.

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Frequency Response You Your spouse Equally with spouse Friend or relative Professional help Not required to file 100 16 31 114 2 TOTAL 270