Suppose We Roll Two Fair Four-Sided Dice

Multiple Choice

Suppose we roll two fair four-sided dice. Let X denote the sum of the two roll outcomes. For example, if the first roll yields 3 and the second roll yields 1, then X = 3 + 1 = 4. The probability distribution for X is given below. The probability of rolling a pair of 4s is:

A) 1/16.
B) 1/8.
C) 3/16.
D) 13/16.