This week in school, there is a 75 percent probability of having a fire drill, a 50 percent probability of a tornado drill,
and a 25 percent probability of having both drills. Let event F be a fire drill and event T be a tornado drill. Are the two
events independent?
No, because P(F NT) # PQP(T).
No, because P(F T) P(F) + P(T).
x Yes, because P(
FT) = P(F). P(T).
Yes, because P(F) = P(T) + P(F NT).
