1) Draw and label a probability scale.

2) List 3 things that we can classify as an “unlikely” event.

3) Assign a value of 0 to 1 of the probability of you having a

job one day.4) Write 4/9 as a decimal and percentage (no calculators).5) What has a greater value, 11/13 or 7/9 (no calculators)?

Review…

Probability Scale…

Impossible CertainEvenChance

Not likely Likely

Relative Frequency in

experiments…Relative

Frequency =

Outcome Frequency

Total Frequency

(all experiments)

Relative Frequency Table…

III12

3

4

5

6

3 =3÷15 = 0.2

1.0

Fill out the relative frequency tables on your graphic

organizer for 5, 25, and 50 dice rolls.

Relative Frequency Table…

IIIII

I

III

IIII

I

12

3

4

5

6

32

1

3

5

1

=3÷15 = 0.2=2÷15 =

0.133=1÷15 = 0.0667=3÷15 =

0.2=5÷15 = 0.333=1÷15 =

0.0667IIII IIII IIII 15 1.0

As relative frequency

experiment trials get closer to

infinity…

Theoretical Probability.

Sample Space

Tree Diagram…

P

123456

Sample Space

S = {…} Example: a bag of skittles…S = {yellow, orange, green,

purple, yellow}n(s) = 5

Pg. 401 # 1-7

What is a favourable outcome?

Simple Probability

P(event) =

# of favourable outcomes

# of total outcomes

How does this compare to the relative frequency formula???

Example…

P(1,2) = 2

6

1

3=

Pg. 404 # 1-9

Conclusion…

We can use relative frequency tables for experimental

probability, but using simple probability is more accurate

and efficient.