An urn contains 6 red balls, 2 green balls, 1 blue ball, and 1 white ball. If a ball is drawn, find the probability of getting a red or white ball.
10 balls total ... 7 are either red or white
To find the probability of getting a red or white ball from the urn, we need to calculate the number of favorable outcomes (red or white balls) and divide it by the total number of possible outcomes.
Step 1: Calculate the number of favorable outcomes.
- There are 6 red balls and 1 white ball in the urn, so the number of favorable outcomes is 6 + 1 = 7.
Step 2: Calculate the total number of possible outcomes.
- The urn contains a total of 6 red balls + 2 green balls + 1 blue ball + 1 white ball = 10 balls.
Step 3: Divide the number of favorable outcomes by the total number of possible outcomes to get the probability.
- P(getting a red or white ball) = 7/10 ≈ 0.7
Therefore, the probability of getting a red or white ball from the urn is approximately 0.7 or 70%.
To find the probability of getting a red or white ball, we need to divide the number of favorable outcomes (red or white balls) by the total number of possible outcomes.
1. Count the number of red and white balls:
- There are 6 red balls.
- There is 1 white ball.
So, there are a total of 6 + 1 = 7 favorable outcomes.
2. Count the total number of balls in the urn:
- There are 6 red balls.
- There are 2 green balls.
- There is 1 blue ball.
- There is 1 white ball.
So, there are a total of 6 + 2 + 1 + 1 = 10 possible outcomes.
3. Divide the favorable outcomes by the total outcomes to get the probability:
Probability = Number of favorable outcomes / Total number of outcomes
Probability = 7 / 10
Probability = 0.7
Therefore, the probability of getting a red or white ball is 0.7 or 70%.