A bag contains only black marbles and white marbles . Ezra reached into the bag without looking , got 30 marbles , and found tha
t 12 of the marbles were black . Ezra is going to reach in the bag again and get one more marble . what is the experimental probability that the marble will be black ?
Since 12 out of 30 marbles were black, you can assume that the percentage of black marbles in the bag is 40% (Ex: 12/30=.4) The probability that the marble you pick is black is equal to the percentage of black marbles in the bag. 40% is equal to 2/5.
