Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles.
-Refer to Data Set 7-1. The probability of drawing a blue marble is
A) .20
B) .25
C) 5
D) none of the other alternatives are correct.

Question

Quizplus · Accepted Answer

The total number of marbles is 3 (red) + 6 (black) + 5 (blue) + 2 (yellow) + 4 (green) = 20 marbles. The probability of drawing a blue marble is the number of blue marbles divided by the total number of marbles, which is 5/20 = 0.25.

Data Set 7-1: Suppose an Urn (A Kind of Jar