If an experiment consists of five outcomes with p (o1) = 0.10, p (o2) = 0.20, p (o3) = 0.30, p (o4) = 0.15, then p (o5) is

Given an experiment with 5 trials, the sum of probabilities is 1.

i. e.

p (o1) + p (o2) + p (o3) + p (o4) + p (o5) = 1

0.10 + 0.20 + 0.30 + 0.15 + p (o5) = 1

0.75 + p (o5) = 1

p (o5) = 1 - 0.75 = 0.25

p (o5) = 0.25