To find the probability of either event s or event t occurring, we can use the formula for mutually exclusive events. When two events are mutually exclusive, the probability of either event occurring is simply the sum of their individual probabilities.
The formula can be expressed as:
P(s or t) = P(s) + P(t)
Given that:
- P(s) = 20
- P(t) = 22
Now substituting the given values into the formula:
P(s or t) = 20 + 22
P(s or t) = 42
Therefore, the probability of either event s or event t occurring is 42.