Karen has a bag containing the following marbles: 3 red marbles
4 green marbles
1 yellow marble
Karen randomly selected a marble from the bag and
then put it back in the bag. She did this a total of
200 times, and 67 times the marble she selected
was red. What was the difference between the
number of times she actually selected a red marble
and the number of times she should have expected
to select a red marble? For this question you’ll have to explain the answer