Of the delegates at a convention, 60% attended the breakfast forum, 70% attended the dinner speech and 40% attended both events. If a randomly selected delegate is known to have attended the dinner speech, the probability that he also attended the breakfast forum is

The probability that he also attended the breakfast forum is is 0.5714 = 57.14%.

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

In which

P(B|A) is the probability of event B happening, given that A happened.

is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Attended the dinner speech.

Event B: Attended the breakfast forum.

70% attended the dinner speech

This means that

40% attended both events.

This means that

The probability that he also attended the breakfast forum is

The probability that he also attended the breakfast forum is is 0.5714 = 57.14%.

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation:

dont think so

step-by-step explanation: