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 how many customers do not buy DVD's?   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 gettinga six on my next roll?123456 I spun a spinner and found the following results. What is the experimental probabilityof my next spin landing on red?red5blue6=green5red4 The probability of my spinner landing on blueis  1/5.  If I spin the spinner 200 times, howmany 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 thecolours of the cars. Below is the table of her results. How many cars did Sarah see?blue6white20 White and Blue  104 94red24green26black18 Sarah is counting cars go by and looks at thecolours of the cars. Below is the table of her results.What is the probability that Sarah will seea blue car next?blue6white20  6/94 (not reduced)  6/95 104/200red24green26black18 Sarah is counting cars go by and looks at thecolours of the cars. Below is the table of her results.What is the probability that Sarah will seea white car next?blue6white20  10/47 (reduced)  20/95 20/200red24green26black18 If an experiment goes on for a long time,the experimental probability often ends up being close to the   Theoretical probability reindeer 1 To find the compliment of an event in probabilityyou just State the same thing State the opposite of the event State how pretty it is The compliment of tossing a die and gettinga 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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