CBEST Math Practice Exam

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If two independent events have probabilities P(A) = 0.40 and P(B) = 0.50, what is P(A and B)?

0.40

0.50

0.20

For independent events, the chance that both happen is the product of their individual probabilities. Multiply 0.40 by 0.50 to get 0.20. So the probability of A and B occurring is 0.20 (or 0.20 as a decimal).

The other numbers don’t reflect the joint occurrence under independence: 0.40 and 0.50 are the individual probabilities, not their intersection, and 0.60 isn’t the product of 0.40 and 0.50.

0.60

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