Fun with probability
- 1. PROBABILITY! Let’s learn about probability and chance!
- 2. What is probability? • Probability is the measure of how likely an event or outcome is. • Different events have different probabilities!
- 3. How do we describe probability? • You can describe the probability of an event with the following terms: – certain (the event is definitely going to happen) – likely (the event will probably happen, but not definitely) – unlikely (the event will probably not happen, but it might) – impossible (the event is definitely not going to happen) • Can you think of examples of each type of event?
- 4. How do we express probabilities? • Usually, we express probabilities as fractions. – The numerator is the number of ways the event can occur. – The denominator is the number of possible events that could occur. • Let’s look at an example!
- 5. What is the probability the spinner will land on the number 3? 1 2 3 4
- 6. Ask yourself the following questions: 1. How many 3’s are on the spinner? 2. How many possible numbers could the spinner land on? 1 2 3 4 1 4
- 7. What is the probability the die will land on an even number? Remember, a die has six sides. Numbers 1, 2, 3, 4, 5, and 6 are each depicted once on the die.
- 8. Ask yourself the following questions: 1. How many even numbers are on the die? 2. How many possible numbers could the die land on? 3 6
- 9. What is the probability that I will choose a red marble? • In this bag of marbles, there are: – – – – 3 red marbles 2 white marbles 1 purple marble 4 green marbles
- 10. Ask yourself the following questions: 1. How many red marbles are in the bag? 2. How many marbles are in the bag IN ALL? 3 10
- 11. Probability Is Fun! • Next time you’re playing a board game or a carnival game, think about the probability of the situation! • In the next few days, you will be conducting probability experiments and designing probability games! • Get ready to use your probability power!