Question

Evelyn rolled two 1-6 number cubes 72 times. How many times should she predict she will roll a sum of 5?

Answer 1

to get a sum of 5, we could have
1 4
2 3
3 2
4 1
so, prob(sumof 5) = 4/36

expected sum of 5 in 72 tries
= (4/36)(72) = 8