单选题 An analyst does research about common probability distributions. Which of the following provides the probability of a range of outcomes?
A. Probability function.
B. Probability density function.
C. Bernoulli function.

【正确答案】 B
【答案解析】[解析] 描述一个区间结果的概率是用概率密度函数来表达的，并用于连续随机变量。概率函数在离散情况下是用于描述某个取值的概率，累计概率函数是描述小于或等于某个数值的概率。