Probability Probability is the mathematical way to see the chance that an outcome will occur. A probability can be shown in different ways.
It can be written as a fraction.
It can be written as a ratio.
It can be written as a percent. The percent chance an outcome will occur. For example you have 50% chance of flipping heads on a two sided coin.
When you are calculating probabilities the equation that you will use is: Number of Desired Outcomes = Probability Total number of outcomes
Outcome - the result of an event
Work to do
1. What is the probability of rolling a 5 on a 6 sided die?
2. What is the probability of rolling a 2 or 3 on a 6 sided die?
3. What is the probability of rolling a 1 on a 6 sided die?
4. What is the probability of rolling a 2 then a 4 on a 6 sided die?
5. What is the probability of rolling a 1, 3 or 5 on a 6 sided die?
6. What is the probability of rolling an even number on a 6 sided die?
7. If you roll two dice what is the probability that their sum will be 12?
When you are working with probabilities there are some important words that you should watch out for. When you see the word "or" in a probability problem you will add the probability for each outcome. For example, if you wanted to find the probability of rolling a 2 or 4 on a 6 sided die you will add the probability of rolling a 2 to the probability of rolling a 4.Click on the link to find more examples.
Probability is the mathematical way to see the chance that an outcome will occur. A probability can be shown in different ways.
Number of Desired Outcomes = Probability
Total number of outcomes
Outcome - the result of an event
Work to do
1. What is the probability of rolling a 5 on a 6 sided die?2. What is the probability of rolling a 2 or 3 on a 6 sided die?
3. What is the probability of rolling a 1 on a 6 sided die?
4. What is the probability of rolling a 2 then a 4 on a 6 sided die?
5. What is the probability of rolling a 1, 3 or 5 on a 6 sided die?
6. What is the probability of rolling an even number on a 6 sided die?
7. If you roll two dice what is the probability that their sum will be 12?
When you are working with probabilities there are some important words that you should watch out for. When you see the word "or" in a probability problem you will add the probability for each outcome. For example, if you wanted to find the probability of rolling a 2 or 4 on a 6 sided die you will add the probability of rolling a 2 to the probability of rolling a 4. Click on the link to find more examples.