Theoretical Probability

Theoretical Probability

Theoretical Probability

 $\Pr obabilty=\frac{number\ of\ possible\ ways\ it\ can\ happen}{total\ number\ of\ outcomes}$  

Find the probability of spinning a number less than 3.

• How many numbers are less than 3?

• How many outcomes are there?

•  $\frac{2}{6}=\frac{1}{3}=.33=33\%$  

Multiple Choice

What's the probability of spinning a number greater than 2?

• 2/6 or 1/3

• 4/6 or 2/3

• 5/6

• 1/6

Multiple Choice

What's the probability of spinning an odd number?

• 33%

• 16%

• 66%

• 50%

• Probability of zero is impossible

• Probability less than 1/2 or 50% is less likely or unlikely

• Probability of 1/2 is even chance

• Probability greater than 1/2 or 50% is likely

• Probability of 1 or 100% is certain.

Multiple Select

Select all the options that are likely to occur.

• Having your birthday on a Monday.

• Rolling a number greater than 1 on a dice.

• Having your birthday not in winter.

• Flipping a heads on a coin.

Open Ended

Write an example of something less likely to occur.

• What's the probability of spinning a number less than 5?

• How many times can I expect to get a number less than 5 if I spin the spinner 150 times?

•  $\frac{4}{6}\left(150\right)$  

• Probability of the event multiplied by how many times you spin. 

Multiple Choice

What's the probability of drawing a green or blue marble?

• impossible

• less likely or unlikely

• even chance

• likely

Multiple Choice

How many times can you expect to roll a 4 if you spin 66 times?

• 4

• 16.5

• 11

• 14

Multiple Choice

In a standard deck of cards what is the probability of drawing a heart? Simplify your fraction. (52 cards in a deck)

• 1/4

• 1/2

• 1/3

• 13/52

Fill in the Blank

Aiden has a bag of marbles and is drawing 40 times and replacing the marble each time. How many times can he expect to draw a red marble?

Poll

Rate your mastery on theoretical probability

• 1: I don't understand

• 2: I am close but want more practice

• 3: I think I can do it.

• 4: I know I can do it.