Probability

Probability

Probability

Probability

Is the measure of how likely something is to happen.


Probability can be written as a fraction, decimal or percent.

Probability is between 0 and 1.

Open Ended

If something has a probability of 1, what do you think that means?

Theoretical

Experimental

Types of Probability

Open Ended

What do you think the word experimental means?

Expected outcome before you do an event.

​Theoretical

Probability found after completing a number of trials.

Experimental

Probability

Theoretical Probability

Draw

What is the probability of rolling a die and getting 4?

The table on the right is possible outcomes of rolling 2 dice.

Two Dice

Draw

Circle all even numbers

Draw

What is the probability of getting a 10, when rolling 2 dice?

Experimental Probability

Example

Multiple Choice

A class tossed coins and recorded 161 heads and 179 tails. What is the experimental probability of tossing a coin and the outcome being heads?

• $$\frac{161}{179}$$

• $$\frac{179}{161}$$

• $$\frac{161}{340}$$

• $$\frac{179}{340}$$

Draw

A jar contains 30 red marbles, 50 blue marbles, and 20 white marbles. You pick one marble from the jar at random. Find the theoretical probability P(red)

Draw

A bag contains 36 red blocks, 48 green blocks, 22 yellow blocks, and 19 purple blocks. You pick one block from the bag at random. Find the theoretical probability

$$P(not\ yellow)$$