red marbles and blue marbles

Question

Nicole's bag contains 2 red marbles and 3 blue marbles.Nicole randomly selects a marble from the bag records the color,and then puts the marbles back in the bag if she does this 100 times how often is her selection likely to be red ?

Answer 1

To answser the question you need to find the probability of drawing a red marble

P(Red) = (#red marbles) / (#all marbles) or 2/5 or 0.4

The likely (or expected) number of red marbles selected in 100 draws is

P(Red) x (number draws) = 0.4 x 100 = 40