Answer to Question #106615 in Statistics and Probability for reggie

Question

If I roll a number cube twice, what is the probability I will end up with a sum of 7 or greater?
HINT: List all the outcomes.

Answer 1

Possible outcomes:

1 1 I 2 1 I 3 1 I 4 1 I 5 1 I 6 1

1 2 I 2 2 I 3 2 I 4 2 I 5 2 I 6 2

1 3 I 2 3 I 3 3 I 4 3 I 5 3 I 6 3

1 4 I 2 4 I 3 4 I 4 4 I 5 4 I 6 4

1 5 I 2 5 I 3 5 I 4 5 I 5 5 I 6 5

1 6 I 2 6 I 3 6 I 4 6 I 5 6 I 6 6

36 outcomes in total

21 fitting outcomes

21/36 = 7/12 ${\approx} 58.33$ %