Answer:
34%
Explanation:
Conditional probability is:
P(A given B) = P(A and B) / P(B)
P(<30 given male) = P(<30 and male) / P(male)
0.40 = P(<30 and male) / 0.60
P(<30 and male) = 0.24
P(male given <30) = P(male and <30) / P(<30)
P(male given <30) = 0.24 / 0.70
P(male given <30) ≈ 0.34