Find each frequency of marginal distribution, assignment help

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Find each frequency of marginal distribution, assignment help

Find each frequency of the marginal distribution

under 6 6 to 9 10 to 14 15-21 over 21 Totals
Never 35 57 79 16 143 330
Once 0 22 35 3 14 74
More than once 0 3 37 0 4 44
Totals 35 82 151 19 161