Answer :
P(E or F) = P(E) + P(F) - P(E and F)
P(E or F) = 0.25 + 0.45 - 0.15
P(E or F) = 0.70 - 0.15
P(E or F) = 0.55
Answer: 0.55
P(E or F) = 0.25 + 0.45 - 0.15
P(E or F) = 0.70 - 0.15
P(E or F) = 0.55
Answer: 0.55