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What is the probability of getting an even number when you roll a die once?.

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Presentation on theme: "What is the probability of getting an even number when you roll a die once?."— Presentation transcript:

1 What is the probability of getting an even number when you roll a die once?.

2 3 out of 6, 3/6 or 50%

3 If you are looking at a pile of jelly beans and you choose one, are you are choosing at random?

4 False

5 When you toss a coin two times, the sample space contains six possible outcomes.

6 False (2 x 2 = 4 possible outcomes)

7 The probability that an event happens is 4/12. What is the probability that the event will not happen?

8 8/12 = 2/3

9 What is the probability of drawing a red face card (i.e., king, queen, or jack) from a full deck of playing cards?

10 6/52 = 3/26

11 If you spin this spinner 30 times, how many times might you expect it to land on red?

12 30 x 1/3 = 30/3 = 10 times

13 There are 14 marbles in a bag: 4 red, 4 orange, 5 green, and 1 blue. You take one marble out of the bag. What is the probability of getting a red or a blue marble?

14 5/14

15 A spinner is divided into 6 equal parts: 3 green, 2 blue, and 1 red. What is the probability of spinning green?

16 3/6 = ½

17 Each letter of the word PROBABILITY is written on a separate card and placed in a bag. Fareshta draws one card from the bag. What is the probability of her drawing a B?

18 2/11

19 How many possible outcomes are there when you flip a coin and roll a six-sided die at the same time?

20 (2 x 6) = 12

21 If you hit the ball 25% of the time you get to bat, how many hits would you expect to get in 40 at-bats?

22 ¼ of 40 = 10 25% of 40 = x 40 = 10

23 Grant successfully makes one half-court shot out of three. What is the probability that he scores two half- court shots in a row?

24 1/9 (independent events)

25 An ice-cream store sells 5 different flavours of ice cream that can be topped with 5 different toppings. How many flavour and topping combinations are there?

26 25 (5 x 5 = 25)

27 Scott’s sock drawer has 6 green socks, 8 white socks, and 4 black socks. What is the probability that he will pull out a white sock?

28 4/9

29 A grade 7 class has 18 boys and 14 girls. If a student is picked at random, what is the probability of picking a boy?

30 9/16

31 What is the probability of picking a sour-apple candy from a jar of candies that has 17 sour apples, 9 sweet berries, and 4 wacky watermelons?

32 17/30

33 In a board game, you can move any number of spaces up to and including the value you spin. The spinner is divided into 4 equal sections, numbered 1 to 4. What is the probability that you win on your next roll, if you are 3 spaces short of the finish line?

34 You need #3 or #4 therefore 2/4 or 1/2

35 To simulate the gender of an unborn baby, you could use

36 a coin (2 outcomes)

37 Four students are running for student council president. Of 30 students polled, 15 choose Mike, 4 choose Jean, 5 choose Winston, and 6 choose Francesca. What is the probability of Jean or Francesca winning the election?

38 10 out of 30 = 10/30 = 1/3 = 33%

39 Jeff saves 75% of the shots on goal. If Jeff faces 20 shots in his next game, how many goals can he expect to let in?

40 75% of 20 = of 20 = 5 ¾ of 20 = 5

41


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