Using proportions, it is found that you would expect to get a sum of 3 22 times.
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
When two dice are rolled, there are 36 total outcomes. 2 of them, (1,2) and (2,1), result in a sum of 3, hence the proportion is given by:
p = 2/36 = 1/18.
Out of 396 tosses, the expected value is given by:
E = 1/18 x 396 = 22.
More can be learned about proportions at https://brainly.com/question/24372153
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