Probability: the chance that a particular event will occur.

When do people use probability◦ Investing in stocks◦ Gambling◦ Weather

What is the probability that tomorrow will be Thursday?

What is the probability that tomorrow will be Monday?

What is the probability that it will rain tomorrow?

What is the probability that you will find $5 today?

0Will Not Happen

1Will Happen

What is the probability that you will get tails when you flip a coin?

Experiment: Flip a coin 100 times. How many heads do you predict you will

get? How many tails do you predict you will get?

Using what we learned from the coin flip experiment:

What is the probability that you will roll a 3 using a six-sided die?

What is the probability that you will roll a 6

What is the probability that you will get a 3 or a 6?

What is the probability that you draw a 9 of hearts from the deck?

What is the probability that you draw a jack from the deck?

You draw a jack from the deck of cards. You leave the jack out of the deck, what is the probability that you will draw a jack the second time?

Color Fraction

Decimal Percent

Blue 13/55 .23 23%Green 13/55 .23 23%Brown 6/55 .10 10%Yellow 10/55 .18 18%Orange 9/55 .16 16%Red 4/55 .07 7%