WAEC Mathematics 2022 Paper

Concept:The addition rule of probability is used to find the chance of at least one event occurring when two events can overlap.Explanation:Let $M$ represent a household reading the Morning Times.Let $E$ represent a household reading the Evening Dispatch.We are given:$P(M) = 0.45$$P(E) = 0.60$$P(M \cap E) = 0.20$Households that read both papers are included in both percentages, so they are counted twice.To find households reading at least one paper, we must subtract the double-counted overlap.Therefore, $P(M \cup E) = P(M) + P(E) - P(M \cap E)$.Substitute the values:$P(M \cup E) = 0.45 + 0.60 - 0.20$$P(M \cup E) = 0.85$This matches option C.Answer:C. $0.85$