A professor records the grades for his class students.He finds that the probability that a student earns an A is p = .14; earns a B is p = .36; earns a C is p = .32; earns a D is p = .10; and earns an F is p = .08.What is the probability that a student earns a B or better in this class?
A) .36
B) .14
C) .86
D) .50

Question

Quizplus · Accepted Answer

The probability of earning a B or better is the sum of the probabilities of earning an A or a B: 0.14 + 0.36 = 0.50.

A Professor Records the Grades for His Class Students