What is the probability that a student will get an a or a, Basic Statistics

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What is the probability that a student will get an a or a

Grades

Assume that the only grades possible in a history course are A, B, C, and lower than C. The probability that a randomly selected student will get an A in a certain history course is 0.18, the probability that a student will get a B in the course is 0.25, and the probability that a student will get a C in the course is 0.37.

a. What is the probability that a student will get an A OR a B?

b. What is the probability that a student will get an A OR a B OR a C?

c. What is the probability that a student will get a grade lower than a C?

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Basic Statistics: What is the probability that a student will get an a or a

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