Question

What is the probability that a randomly chosen contestant tried raking the ground or charmed 5 - 10 worms

Answer 1

According to the problem, the probability that a contestant tried ranking the ground is 0.7 and the probability that a contestant charmed 5-10 worms is 0.3.

So, the probability of A or B happening is-

$P(A\cup B)=P(A)+P(B)-P(A\cap B)$

Because the events are not mutually exclusive, where

$P(A\cap B)=P(A)\cdot P(B)=0.7\cdot0.3=0.21$

Then,

$P(A\cup B)=0.7+0.3-0.21=0.79$Hence, the probability is 0.79.