Experimental Probability and Complimentary Events

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 single die 20 times and got the 

following results.

What is my experimental probability of getting

a six?

1
2
3
4
5
6

I spun a spinner and found the following

results. What is the experimental probability

of a spin landing on red?

red
5
blue
6
=
green
5
red

4

My spinner is a full 360° circle. The blue section is a 

72° section. If I randomly flick the spinner 445 times, 

how many times should it land on blue?

(445 - 72) times
445 - (360° ÷ 72°) times
445 ÷ (360°÷72°) times
  445

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
  6/95
  6/94 (not reduced)
unlikely
 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 or red or green car next?

blue

6
  70%
 70
the sum of the individual probabilities
94/100
white
20
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

complement
  theoretical probability
subjective probability
 100%

To find the complement of an event in probability

you just

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

The complement 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 complement 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 complement 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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