Question

A bag contains 39 red marbles, 6 white marbles, and 7 gray marbles. You randomly pick out a marble, record its color, and put it back in the bag. You repeat this process 208 times. How many white or gray marbles do you expect to get

Answer 1

52

Explanation:

The total number of marbles = 6 + 7 +39 = 52.

The total number of white and gray marbles = 6 + 7 = 13

P(white or gray) = number of desired outcomes/total number of outcomes

number of desired outcomes = total number of white and gray marbles = 13

total number of outcomes = total number of marbles = 52.

P(white or gray) = 13/52 = 1/4

The number of white of gray marbles that we expect to get after repeating the process 208 times is 208 × P(white or gray) = 208 × 1/4 = 52