In a class, 60% students pass in English and 70% in Mathematics. 20% fail in both. The percentage that pass in at least one subject is: MCQ with Answer and Explanation

Explanation:
Exhaustive events cover the entire sample space.

Explanation:
Minimum occurs when one event is subset of the other; if B⊂A, then P(A∪B)=P(A)=0.2. But A cannot be larger than B? Actually min union is max(P(A),P(B)) = 0.3.

Explanation:
An ogive plots cumulative frequencies against class boundaries, providing a visual representation of cumulative distribution and enabling estimation of medians and percentiles.