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In an experiment, the probability that event $A$ occurs is $\frac{5}{6}$ , the probability that event $B$ occurs is $\frac{1}{3}$ , and the probability that events $A$ and $B$ both occur is $\frac{5}{18}$ . $\newline$ 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{5}{6}

, the probability that event

B

occurs is

\frac{1}{3}

, and the probability that events

A

and

B

both occur is

\frac{5}{18}

.

\newline

Are

A

and

B

independent events?

\newline

Choices:

\newline

(A) yes

\newline

(B) no

Check for Independence: To check if events $A$ and $B$ are independent, we need to see if the probability of $A$ and $B$ occurring together ( $P(A \text{ and } B)$ ) is equal to the product of their individual probabilities ( $P(A) \times P(B)$ ).
Calculate Product of Probabilities: First, calculate the product of $P(A)$ and $P(B)$ . $\newline$ $P(A) \times P(B) = \left(\frac{5}{6}\right) \times \left(\frac{1}{3}\right)$
Multiply the Probabilities: Now, do the multiplication. $\newline$ $(\frac{5}{6}) \times (\frac{1}{3}) = \frac{5}{18}$
Compare Results: Next, compare this result to the given probability of A and B occurring together, which is $P(A \text{ and } B) = \frac{5}{18}$ .
Events $A$ and $B$ are Independent: Since $P(A) \times P(B) = P(A \text{ and } B)$ , the events $A$ and $B$ are independent.

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