单选题 Which of the following random variables would be most likely to follow a discrete uniform distribution?

A. The outcome of the roll of two standard, six - sided dice where X is the sum of the numbers facing up.
B. The number of heads on the flip of two coins.
C. The outcome of a roll of a standard, six - sided die where X equals the number facing up on the die.

【正确答案】 C

【答案解析】The discrete uniform distribution is characterized by an equal probability for each outcome. A single die roll is an often - used example of a uniform distribution. In combining two random variables, such as coin flip or die roll outcomes, the sum will not be uniformly distributed. The number of red coats to yellow coats is a ratio that is not likely uniformly distributed.