PROBABILITY

WHAT IS PROBABILITY?

Probability is how likely something will happen. Say you are flipping a coin. The probability it will land on heads or tales in 50%.

HOW DO WE DETERMINE

TO DETERMINE...

• Divide the number of ways a event can happen-
• By the total number of outcomes to get your answer.
• Ex. John is Drawing out of a bag with 5 different colored-
• tiles. He wants to draw one of the two red ones. What is-

EXAMPLE

• The Probability he will draw a red tile?
• 1. Set up Problem.
• 2➗5
• 2. Solve.
• 2➗5= 0.40

EXAMPLE

• 3. Change into percent.
• 0.40= 40%
• Final Answer- the probability of drawing
• a red tile is 40%!

WHAT IS A COMPLEMENT?

A complement is all the ways a event cannot happen.

WHAT IS THE DIFFERENCE

THEORETICAL PROBABILITY

• Theoretical Probability is calcuated using math
• Formulas.
• It is based on the math theory.

EXPERIMENTAL PROBABILITY

• Experimental probability is calculated when
• the actual problem is performed as a experiment.
• You use the results to determine the probability.

EXPAMPLES

What is the chance Sally will roll a six in a dice?

1➗6 is about .167.

If we covert that to a percent we get 16.7%!

The chance of rolling a six on a dice is 16.7 percent!