Question

I was given the answer, but was confused of how it got to there—please help!

Answer 1

0.73

Explanation:

the probability that it is not X is 1-0.4 = 0.6

The probability that it is not Y is 1-0.5 = 0.5

The probability that it is not Z is 1-0.1 = 0.9

So the probability that it is not any of these is

0.6x0.5x0.9 = 0.27

So the probability that it is X Y or Z is 1-0.27 = 0.73