Question

Bill estimates that 20 people will attend the seminar if it does not rain and 12 people will attend if it rains. The weather forecast indicates a 40% chance it will not rain and a 60% chance it will rain on the day of the seminar. Determine the expected number of people who will attend the seminar.

Answer 1

12 people will attend

Answer 2

$E(X)=20\times0.4+12\times0.6=15.2$
The answer is 15.2 people.