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I'm not quite sure how to do this problem:

Calculate the the proportion of values that is 3 in the following data set:

2, 3, 3, 6, 9

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You have 5 values, and 2 of these are 3. Therefore, the proportion of the data that is 3 is given by $$\frac{\text{number of 3s}}{\text{number of data}}=\frac{2}{5}$$

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The proportion, in general, is just the ratio of the frequency of a datum you are given to the number of elements in your data. For example, in the set 1,2,3,3,4, the proportion of $1$ to the rest of the data is,$${\text{frequency of 1}\over \text{total number of data}} = {1 \over 5}$$Given the above example, can you now perform your question?

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1  
+1 for datum! – Brian M. Scott Dec 19 '12 at 10:10

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