Step-by-step Answer:
Given:
W=vehicle is White
T=vehicle is a pick-up Truck
P(W and T)=0.06
P(W)=0.25
P(T)=0.15
We need the conditional probability that a vehicle is white, given that it is a pick-up truck:
P(W | T)
= P(W and T) / P(T)
= 0.06 / 0.15
=0.4