Which one of the following probabilities is a cumulative probability?
A) The probability that there are exactly 4 people with Type O+ blood in a sample of 10 people.
B) The probability of exactly 3 heads in 6 flips of a coin.
C) The probability that the accumulated annual rainfall in a certain city next year, rounded to the nearest inch, will be 18 inches.
D) The probability that a randomly selected woman's height is 67 inches or less.

Question

Quizplus · Accepted Answer

Cumulative probability refers to the probability that a random variable is less than or equal to a certain value. Choice D, which is about the probability of a woman's height being 67 inches or less, fits this definition as it accumulates all probabilities of heights up to and including 67 inches.

Which One of the Following Probabilities Is a Cumulative Probability