A Researcher Records the Number of Mistakes Made During a Memory

A researcher records the number of mistakes made during a memory skills task.He finds that the probability that participants in this study made 0 mistakes is p = .22; made 1 mistake is p = .30; made 2 mistakes is p = .16; made 3 mistakes is p = .12; and made 4 or more mistakes is p = .25.Is this probability distribution accurate?

A) Yes, it distributes all possible outcomes for the random variable.
B) No, one of the outcomes is stated as "or more."
C) No, the probability distribution does not sum to 1.0.
D) No, one of the outcomes is stated as "or more" and the probability distribution does not sum to 1.0.