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In an experiment, the probability that event $A$ occurs is $\frac{1}{2}$ , the probability that event $B$ occurs is $\frac{3}{4}$ , and the probability that events $A$ and $B$ both occur is $\frac{3}{7}$ . What is the probability that $A$ occurs given that $B$ occurs? Simplify any fractions.

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Find conditional probabilities

Full solution

Q. In an experiment, the probability that event

A

occurs is

\frac{1}{2}

, the probability that event

B

occurs is

\frac{3}{4}

, and the probability that events

A

and

B

both occur is

\frac{3}{7}

. What is the probability that

A

occurs given that

B

occurs? Simplify any fractions.

Use Conditional Probability Formula: To find the probability that $A$ occurs given that $B$ occurs, we use the formula for conditional probability: $P(A|B) = \frac{P(A \text{ and } B)}{P(B)}$ .
Calculate $P(A|B)$ : We know $P(A \text{ and } B) = \frac{3}{7}$ and $P(B) = \frac{3}{4}$ . So, $P(A|B) = \frac{\frac{3}{7}}{\frac{3}{4}}$ .
Multiply Fractions: To divide the fractions, we multiply by the reciprocal of the second fraction: $(\frac{3}{7}) \times (\frac{4}{3})$ .
Simplify Result: Now, multiply the numerators and denominators: $\frac{3 \times 4}{7 \times 3}$ .
Simplify Result: Now, multiply the numerators and denominators: $(3 \times 4) / (7 \times 3)$ .We can simplify by canceling out the common factor of $3$ : $4/7$ .

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