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In an experiment, the probability that event $A$ occurs is $\frac{1}{4}$ , the probability that event $B$ occurs is $\frac{1}{3}$ , and the probability that events $A$ and $B$ both occur is $\frac{1}{12}$ . $\newline$ Are $A$ and $B$ independent events? $\newline$ Choices: $\newline$ (A) yes $\newline$ (B) no

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Identify independent events

Full solution

Q. In an experiment, the probability that event

A

occurs is

\frac{1}{4}

, the probability that event

B

occurs is

\frac{1}{3}

, and the probability that events

A

and

B

both occur is

\frac{1}{12}

.

\newline

Are

A

and

B

independent events?

\newline

Choices:

\newline

(A) yes

\newline

(B) no

Check Independence: To check if $A$ and $B$ are independent, we need to see if $P(A \text{ and } B)$ equals $P(A) \times P(B)$ .
Calculate $P(A) \times P(B)$ : Calculate $P(A) \times P(B)$ : $\frac{1}{4} \times \frac{1}{3} = \frac{1}{12}$ .
Compare Probabilities: Compare $P(A \text{ and } B)$ with $P(A) \times P(B)$ : Since $P(A \text{ and } B)$ is $\frac{1}{12}$ and $P(A) \times P(B)$ is also $\frac{1}{12}$ , they are equal.
Events A and B: Since $P(A \text{ and } B) = P(A) \times P(B)$ , events A and B are independent.

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