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Experimental Probability and Complimentary Events
Contributed by: Schuller Glase

A store sells 28% of its DVD's to all

people that come into the shop.

What percentage of people do not buy DVD's?

 28%
 72%
 128%
 60%

42% of customers do not buy DVD's. 

2000 people come into the store.

What would you put into your calculator to

find the answer?

 

  2000 ÷ 42%

  42% × 2000

 

  2000 ÷ 58%
  58% × 2000

I tossed a dice 20 times and got the following

results.

What is my experimental probability of getting

a six on my next roll?

1
2
3
4
5
6

I spun a spinner and found the following

results. What is the experimental probability

of my next spin landing on red?

red
5
blue
6
=
green
5
red

4

The probability of my spinner landing on blue

is  1/5.  If I spin the spinner 200 times, how

many times would I guess it would land on blue?

 4/5  ×  200  =  160
  200
 1/5  ×  200  = 40

Sarah is counting cars go by and looks at the

colours of the cars.

Below is the table of her results.

 

How many cars did Sarah see?

blue

6
white
20
 White and Blue
  104
 94
red
24
green
26

black

18

Sarah is counting cars go by and looks at the

colours of the cars.

Below is the table of her results.

What is the probability that Sarah will see

a blue car next?

blue

6
white
20
  6/94 (not reduced)
  6/95
 104/200
red
24
green
26

black

18

Sarah is counting cars go by and looks at the

colours of the cars.

Below is the table of her results.

What is the probability that Sarah will see

a white car next?

blue

6
white
20
  10/47 (reduced)
  20/95
 20/200
red
24
green
26

black

18

If an experiment goes on for a long time,

the experimental probability often end up being

close to the

  Theoretical probability
 reindeer
 1

To find the compliment of an event in probability

you just

 State the same thing
 State the opposite of the event
 State how pretty it is

The compliment of tossing a die and getting

a 4 is:

 Tossing a die and getting a 1,2,3,5 or 6
 Tossing a die and getting a 3
  Tossing a die and losing

Another way of stating the compliment of

tossing a die and getting a 4 is:

 Tossing a die and not getting a four
 Tossing a die and getting a 1
  Tossing a die and winning

The compliment of a horse winning a race is

  The horse not winning the race
 The horse coming in second

 The horse turning into a chicken

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