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Assume the only grades possible in a history course are​ A, B,​ C, or lower than C. The probability that a randomly selected student will get an A in the course is 0.44, the probability that a student will get a B in the course is 0.24​, and the probability that a student will get a C in the course is 0.13.

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?

 Apr 5, 2020
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a 44%+24%=68%

b 68%+13%=81%

c 100%-81%=19%

 

smileysmileysmiley

 Apr 5, 2020

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