PROBABILITY! Let’s learn about probability and chance!

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Presentation transcript:

PROBABILITY! Let’s learn about probability and chance!

What is probability? Probability is the measure of how likely an event or outcome is. Different events have different probabilities!

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?

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!

What is the probability the spinner will land on the number 3?

Ask yourself the following questions: 1. How many 3’s are on the spinner? 2. How many possible numbers could the spinner land on?

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.

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

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

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

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!