Hi

A class of 50 students obtained the following grades in a statistics course

"of which" this was the dstribution: A 5, B 25, C 15, D5

one student is selected at random

P(student obtained a B) = 25/50 = 1/2

P(student obtained either B or a C)= 40/50 = 4/5

P(student did not obtain a D)= 45/50 = 9/10

P(student did not obtain a B or C) = 10/50 = 1/5 

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