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 marble that is red, yellow, black or green is
A) .25
B) .50
C) .75
D) 1.00.

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 marble that is red, yellow, black, or green is the sum of the probabilities of drawing each of these colors. This is (3 + 6 + 2 + 4) / 20 = 15 / 20 = 0.75.

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