1. MAKING
PREDICTIONS USING
PROBABILITY

2. PROBABILITY SCALE
1
0.75
0.25 0.5
0
50% 75% 100%
25%
0%
very
equal
less always
never
likely
chance
likely

3. TOSSING A COIN:
P( ) = 0%
P( ) = 50%
P( ) = 100%

4. ROLLING A PAIR OF DICE:
P( ) = 0%
P( ) = 50%
P( ) = 100%

5. EX There is a 1 in 5 chance that someone will be born with blonde hair. Out of a
group of 250 random people, how many are expected to have blonde hair?

6. EX In a carton of a dozen eggs, one is expected to be broken every time. How
many would you expect to be broken in a case of 216 eggs?

7. EX A store is giving away 15 free ipods today. They have given away 7 already.
If you walk in the store and there are 480 people left in the store, what is your
percent chance of getting a free one?

8. HOMEWORK:
p.331; #1­8

9. BONUS CHALLENGE:
5 BONUS MARKS ON UNIT TEST!!!!

10. What is your probability of winning the jackpot?
This means with one ticket, what are your chances
(as a reduced fraction) of getting all six numbers
correct?
* You select any 6 numbers from the numbers 1 through 49.
* Six numbers are then drawn one by one out of a machine.
* Find the probability of drawing each number, one by one, separately then multiply all of them together to get one
fraction, which you can reduce to....1 out of ?.
*
*
*
* *
2nd # 3rd #
1st # 4th # 5th # 6th #

11. SOLUTION
*
*
*
* *
2nd # 3rd #
1st # 4th # 5th # 6th #