Question

Suppose for events a and b we know p(a) = 0.3, p(b) = 0.5 and p(a and b) = 0.2 find p(a or b)

Answer 1

0.6

Explanation:

P(a or b) = P(a) + P(b) - P(a and b)

= 0.3 + 0.5 - 0.2

= 0.6