Question

The table gives a set of outcomes and their probabilities. Let A be the event "the outcome is a divisor of 3". Find P(not A).
Outcome Probability
1 0.28
2 0.189
3 0.072
4 0.097
5 0.132
6 0.044
7 0.186

Answer 1

Divisors of 3 in the sample space are 1 and 3, so
P(A) = P(1)+P(3) = 0.28 + 0.072 = 0.352.
Therefore P(not A) = 1 − 0.352 = 0.648.