Question

Tamara finds the sum of two number cubes rolled at the same time. The chart below shows all possible sums from the 36 possible combinations when rolling two number cubes. How many times should Tamara expect the sum of the two cubes be equal to 9 if she rolls the two number cubes 252 ​times?
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Part 1
The sum should be equal to 9 about
  
enter your response here ​time(s).

Answer 1

There are 4 outcomes that sum to 9 out of 36 possible pairs, so the probability is 4/36 = 1/9. Expected times = 252 × 1/9 = 28.

Tamara should expect the sum to be 9 about 28 times.