Question

If P(B) = 0.3, P(A and B) = 0.5, find P(A).

Answer 1

P(A)=0.2

Explanation:

P(A and B)= P(A) + P(B)

since P(B)=0.3 then replace P(B) for 0.3

since P(A) + 0.3 = 0.5, then

P(A)= 0.5 - 0.3

P(A)=0.2