Assume that you have an urn containing 10 balls of the following description:
4 are white (W)and lettered (L)
2 are white (W)and numbered (N)
3 are yellow (Y)and lettered (L)
1 is yellow (Y)and numbered (N)
If you draw a lettered ball (L),the probability that this ball is white (W)is 0.571.

Question

Quizplus · Accepted Answer

The probability of drawing a lettered ball is (4+3)/10 = 7/10.
The probability of drawing a white and lettered ball is 4/10.
Therefore, the probability that a lettered ball is white is 4/7 or 0.571. Hence, the statement is true.

Assume That You Have an Urn Containing 10 Balls of the Following