One ball is drawn at random from a bag containing 17 red R balls and 2 white W balls. What is the probability that the ball is red?

Question

One ball is drawn at random from a bag containing 17 red R balls and 2 white W balls. What is the probability that the ball is red? ​

Quizplus · Accepted Answer

The probability of drawing a red ball is the ratio of the number of red balls to the total number of balls in the bag. 
Therefore, 
Probability of drawing a red ball = Number of red balls / Total number of balls 
= 17 / (17+2) 
= 17/19 
= 0.8947368421052632 
≈ 0.895 
Therefore, the answer is B, which corresponds to 0.895.

One Ball Is Drawn at Random from a Bag Containing