Question

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Answer 1

For a set of trials $P_{desired}=\frac{desired}{total}$. In this case our desired out come is all multiples of 3: 3,6,9 and 12. The total number of outcomes can be found as 100 by adding up all the frequencies. Thus our experimental probability is $P_{x=3n}=\frac{6+14+12+1}{100}=\frac{33}{100}=33\%$.