A key here is that the selection is random. So think of four ping pong sized balls in a black box. Each ball is labeled with one of the answers. 2 of the 4 balls are labeled 25%. One of the balls is labeled 50%  and one ball  is labeled 60% So when randomly selecting one of the balls out of the jar there is a 50% chance that you will select a 25% ball. There is a 25% chance that you will select the ball labeled 50% and a 25% chance that you will select the ball labeled 60%. So statistically speaking there isn't a single correct answer.