Question

Ellen has a bag with 3 red marbles and 2 blue marbles in it. She is going to randomly draw a marble from the bag 300 times, putting the marble back in the bag after each draw.What is the best prediction for the number of times that Ellen will draw a blue marble?

Answer 1

The best prediction would be close to 120, not exactly 120.

Explanation:

Answer 2

No. of times Ellen draws a blue marble = 120

Explanation:

No. of red marbles = 3

No. of blue marbles = 2

`\text{Probability of drawing a blue marble = }\frac{\text{No. of possible outcomes}}{\text{Total no. of outcomes}}\\\\P(B)=(2)/(5)\\\\No. of draws (n) = 300\\\text{So, total probability = }n* P(B)\\\\=100* (2)/(5)=120.`

So, the required probability is 120.