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In an experiment, the probability that event $A$ occurs is $\frac{5}{7}$ , the probability that event $B$ occurs is $\frac{1}{7}$ , and the probability that events $A$ and $B$ both occur is $\frac{5}{49}$ . 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}{7}

, the probability that event

B

occurs is

\frac{1}{7}

, and the probability that events

A

and

B

both occur is

\frac{5}{49}

. Are

A

and

B

independent events?

\newline

Choices:

\newline

(A)yes

\newline

(B)no

Check Independence Criteria: 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 $P(B)$ . $\newline$ $P(A) \times P(B) = \left(\frac{5}{7}\right) \times \left(\frac{1}{7}\right)$
Multiply Probabilities: Now, do the multiplication. $\newline$ $(\frac{5}{7}) \times (\frac{1}{7}) = \frac{5}{49}$
Compare Results: Next, compare this result to the given probability of $A$ and $B$ occurring together, which is $\frac{5}{49}$ .
Conclusion: Since $P(A \text{ and } B)$ is equal to $P(A) \times P(B)$ , the events $A$ and $B$ are independent.

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