Answer:
It will be 1/4 (25%) and 1/2 (50%) if you do them separate. If you do the probability together, the answer will be 1/8 (12.5%)
Explanation:
If she has 4 hats, there is a 1/4 (25%) probability that she will pick a blue hat. If she has 2 scarfs, there is a 1/2 (50%) probability that she will pick a white scarf. If you want to find the probability for the whole thing, then you will multiply 1/4 (25%) by 1/2 (50%).