Event A: replies 3/10 messages
Event B: sits by the pool 4/7 days per week
When we say independent events, the next events are not affected by the previous events.
The probability of Event A and B is equal to the probability of A multiplied to the Probability of B. In this case, we have:
Thus, the probability that she replies to a text and sits by the pool is 6/35 or 17.14%.