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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?

1 2
3 4
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
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!


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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! 