Question

The tree diagram represents an
experiment consisting of two trials.
P(D) =[?]

Answer 1

P(D) = 0.7

Explanation:

There are two routes to D:

1. AD, which is 0.5*0.6
2. BD, which is 0.5*0.7

We then add these two probabilities:

AD + BD = (0.5*0.6) + (0.5*0.7) = 0.3 + 0.35 = 0.7

Therefore, P(D) should be 0.7, or 70%