Question

You fairly roll two dice. Let X be the sum of the two dice. What is the probability of getting 7 as the sum?
Select one:
a. 1/6
b. 1/9
c. 6/36
d. 1/13
I'm confused... 7??

Answer 1

Answer:

answer is both a and c

Step-by-step explanation:

when a single die is rolled, possible outcome are 1,2,3,4,5,6.

when two dies are rolled, possible outcome are 36.

given that X is the sum of outcomes of two die, therefore possible outcomes having sum = 7 is

(1,6), (2,5), (3,4), (4,3), (5,2), (6,1).

therefore possible outcomes of sum having 7 is 6 pairs.

probability of getting sum 7 =

possible outcomes of pairs having sum 7 / total number of outcomes

therefore 6/36 = 1/6.