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In an experiment, the probability that event $A$ occurs is $\frac{1}{5}$ , the probability that event $B$ occurs is $\frac{1}{7}$ , and the probability that events $A$ and $B$ both occur is $\frac{1}{35}$ . $\newline$ 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}{5}

, the probability that event

B

occurs is

\frac{1}{7}

, and the probability that events

A

and

B

both occur is

\frac{1}{35}

.

\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 Individual Probabilities: Calculate $P(A) \times P(B)$ : $(\frac{1}{5}) \times (\frac{1}{7}) = \frac{1}{35}$ .
Compare Probabilities: Compare $P(A \text{ and } B)$ with $P(A) \times P(B)$ : Since $P(A \text{ and } B)$ is $\frac{1}{35}$ and $P(A) \times P(B)$ is also $\frac{1}{35}$ , they are equal.
Confirm Independence: Since $P(A \text{ and } B) = P(A) \times P(B)$ , events $A$ and $B$ are independent.

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