A ball is draw at random form a box containing 6 red balls, 4 white balls and 5 blue balls. what is the probability that the ball drawn is (1)red (2)white (3)blue (4)red or blue
1. red balls over total = ?
2. white balls over total = ?
3. blue balls over total = ?
4. 1 + 3 = ?
To find the probability of drawing a particular color ball, divide the number of balls of that color by the total number of balls in the box.
Total number of balls in the box = 6 red + 4 white + 5 blue = 15 balls.
1) Probability of drawing a red ball = Number of red balls / Total number of balls
P(red) = 6 / 15 = 2/5
2) Probability of drawing a white ball = Number of white balls / Total number of balls
P(white) = 4 / 15
3) Probability of drawing a blue ball = Number of blue balls / Total number of balls
P(blue) = 5 / 15 = 1/3
4) Probability of drawing a red or blue ball:
Since the event is drawing either a red or blue ball, we add the number of red and blue balls together.
Number of red or blue balls = 6 red + 5 blue = 11 balls
P(red or blue) = Number of red or blue balls / Total number of balls
= 11 / 15