Calculating One Given the Others

Probability = Success / Total  Example: If you have 6 socks and 2 are red, what is the probability of randomly choosing a red sock? Success=Red Sock=2 Total=Total Socks=6 Probability of choosing a red sock? 2/6 → 1/3 Divided By

 If you have 18 marbles and 3 of them are red, 6 are blue and 9 are yellow, what is the probability of randomly choosing a red one? A. 1/6 D. 1/2 B. 1/3 C. 1/18 Remember success is the number of red marbles and total is the total number of Marbles. You may need to reduce your answer. Try again. Wow! Click on the option above that you think is the correct answer.

Odds = Success : Failure  Example: If you have 6 socks and 2 are red, what are the odds of randomly choosing a red sock? Success=red sock=2 Failure=non-red socks=4 Probability of choosing red sock? 2:4 → 1:2 Number of ways the event can occur : compared to the number of ways the event can fail.

 If you have 18 marbles and 3 of them are red, 6 are blue and 9 are yellow, what are the odds of randomly choosing a red one? A. 1:6 D. 1:5 B. 1:18 C. 1:2 Click on the option above that you think is the correct answer. Remember success is the number of red marbles and failure is the number of non-red marbles. You may need to reduce your answer. Try again. Supe r

 Example: If the probability of an event is 2/3, what are the odds of this event? 1. Remember that probability is success/total. 2. If the total = 3 and the success = 2, failure is total-success = 3-2 =1 3. Odds = success : failure = 2:1

1 20 On average, 1 out of every 20 people wins, and the other 19 people lose. The odds in favor of winning the meal are 1:(20 – 1), or 1:19. The probability of winning a free dinner is. What are the odds of winning a free dinner?

The probability of winning a free laptop is. What are the odds of winning a free laptop? 1 30 On average, 1 out of every 30 people wins, and the other 29 people lose. The odds in favor of winning the laptop are 1:(30 – 1), or 1:29.

 Click here for a video explaining how to solve these types of problems Click here for a video explaining how to solve these types of problems (Ignore the part that talks about Odds against)

 If the probability of an event are 2/5, what are the odds of this event? A. 3:2 D. 5:3 B. 2:7 C. 2:3 Remember to find the failure, you need to subtract total-success Grea t! Click on the option above that you think is the correct answer.

 Example: If the odds of an event is 2:3, what is the probability of this event? 1. Remember that odds is success : failure 2. If the failure = 3 and the success = 2, total is failure + success = 3+2 = 5 3. Probability = success / total = 2/5

If the odds of winning a CD player in a school raffle are 1:49, what is the probability of winning a CD player? On average there is 1 win for every 49 losses, so someone wins 1 out of every 50 times. P(CD player) = =

If the odds of winning a bicycle in a raffle are 1:75, what is the probability of winning a bicycle? Hint: On average there is 1 win for every 75 losses, so someone wins 1 out of 76 times. P(bicycle) = =

 Click here for a video explaining how to solve these types of problems Click here for a video explaining how to solve these types of problems

 If the Odds of an event are 2:5, what is the probability of this event? A. 3/2 D. 5/3 B. 2/7 C. 2/3 Remember to find the total, you need to add failure + success Cool! Click on the option above that you think is the correct answer.

 Complete the Probability vs. Odds assignment now.Probability vs. Odds