1. 2. There are 3 red, 7 blue and 6 green marbles in a bag.
Probability
Probability: P (event) tells you
It is expressed as a number
between _________ and ________.
Theoretical Probability:
P (event) =
Probability of a single event:
1. What is the theoretical probability of rolling an even number on a number cube?
2. There are 3 red, 7 blue and 6 green marbles in a bag.
What is the theoretical probability of pulling out a green marble?
3. What is the theoretical probability of pulling a 9 from a deck of playing cards?
4. A bowl contains 12 slips of paper, each with a different name of a month. Find the theoretical probability that a slip selected at random from the bowl has a name of a month that starts with the letter J.
how likely it is that something will occur
zero
one
number of favorable outcomes
number of possible outcomes

2. number of times an event occurs
Experimental Probability:
P (event) =
5. You flip a coin 10 times. It lands on heads 7 times. What is your experimental probability of getting heads?
How does it differ from the theoretical probability?
6. Jason rolled two dice at once. He rolled doubles on 4 out of 10 rolls. Calculate his
experimental probability for rolling doubles and compare it to the theoretical probability.
NOTE! (It may help to draw a chart of possible outcomes involving two dice.) 7.
number of times an event occurs
number of times the experiment is done