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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 |