airelle2970 airelle2970

27-12-2022
Mathematics

Answered

in a history class, the probability of earning an a is $ 0.7 $ times the probability of earning a b, and the probability of earning a c is $ 1.4 $ times the probability of earning a b. assuming that all grades are a, b, or c, how many b's will there be in a history class of $ 31 $ students?

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