Chance and Probability

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1 F Student Book Name

2 Series F Contents Topic Chance and probability (pp. 0) ordering events relating fractions to likelihood chance experiments fair or unfair the mathletics cup create greedy pig solve Date completed / / / / / / / / / / / / Series Authors: Rachel Flenley Nicola Herringer Copyright

3 Chance and probability ordering events Probability measures how likely something is to happen. An event that is certain to happen has a probability of. An event that is impossible has a probability of 0. An event that has an even or equal chance of occurring has a probability of or 0%. 0 impossible unlikely even chance (0%) likely certain Are these events impossible, certain or an even chance? Complete this table. The first one has been done for you. 0 impossible even chance (0%) certain Event The month after June will be February. You will get an odd number when you roll a single die. The year after 00 will be 007. When you flip a coin it will land on tails. The day after Saturday will be Sunday. Probability impossible Draw a line to match each spinner with the correct statement: It is unlikely that this spinner will stop on grey. It is certain that this spinner will stop on grey. There is an even chance that this spinner will stop on grey. Matilda has these blocks: Matilda is going to put 9 blocks in a bag using some of each type and then ask a friend to choose one without looking. If she wants to make it more likely that a cylinder is chosen and less likely that a cube is chosen, how many of each block should she place in the bag? Circle the blocks she could choose. cubes cones cylinders F

4 Chance and probability ordering events Show the probability of each event by placing a, b, c and d on the probability scale below: Spinner Spinner 0 a You will get an even number when you spin Spinner. b You will get an odd number when you spin Spinner. c You will get a number when you spin Spinner. d You will get a face when you spin Spinner. This gumball machine dispenses a random gumball each time its button is pressed. _ Of the 0 gumballs in the machine, are blueberry flavour, 6 are strawberry, are lime and 9 are orange flavour. a Which flavour is most likely to be dispensed? b Which flavour is least likely to be dispensed? c Charlie loves lime flavour but hates strawberry. Adrian loves strawberry but hates orange. Who is more likely to get what they want, Charlie or Adrian? Why? d Write the flavours in order, from the most likely to the least likely to be dispensed: 6 Use red, yellow, green and blue pencils to shade these spinners: Spinner Spinner Spinner Spinner a Shade Spinner so there is an equal chance of the arrow landing on red or yellow. b Shade Spinner so the arrow is most likely to land on yellow. c Shade Spinner so there is no chance of the arrow landing on blue. d Shade Spinner so the arrow is least likely to land on blue or red. F

5 Chance and probability relating fractions to likelihood So far we have looked at the language of chance and outcomes either being at 0 (impossible), (even) or (certain). But what is the likelihood of outcomes in the unlikely range or the likely range? Outcomes in these ranges can be expressed as either fractions, decimals or %. Remember that when finding the chance or likelihood of an event occurring, we must look at all possible outcomes. likelihood of event occurring chance = number of possible outcomes There are 0 chocolates in a box that all look the same. There are 6 milk, caramel, mint and _ 7 dark chocolates. a If you choose one chocolate without looking, which chocolate are you most likely to get? b Which chocolate are you least likely to get? c Show the chance of selecting each type of chocolate as a fraction: milk = 6 0 caramel = dark chocolate = mint = d Colour the word that best describes the chance of selecting a mint chocolate: certain even unlikely impossible Use this table to work out all the possible totals for _ a pair of five-sided spinners. Colour match the totals. Make all the 6s yellow, all the s blue and so on. Spinner 6 Spinner Look at the table above. a Which total is most likely? b What is the likelihood of this total occurring? Express your answer as a fraction: c Which total is least likely? d Express its likelihood as a fraction. F

6 Chance and probability relating fractions to likelihood Complete these tables to show the probability that this die will land on _ the following numbers: Write the probability as a fraction. Event Probability Event Probability An odd number A number greater than 7 An even number Tamsin is playing a game where she is given a choice of how the die should land to signal that it is her turn. _ Which option gives her the best chance of getting a turn? When a number less than is rolled When a number greater than is rolled 6 Tilly and Bec were playing a game with these cards. They laid all the cards face down and then took turns _ turning over. If the cards turned over were the least likely pair of cards, then they scored 00 points. Which two cards do you think scored 00 points? a How many possible combinations are there? Let s work it out. A X 0 Possible Pair Combinations A A X b Look closely at the table. Colour in the pairs in the following manner: symbol/letter blue letter/symbol red letter/letter yellow symbol/symbol orange c Count how many of each colour there are in the table: blue yellow X A A X X X X A X red d What fraction shows the chance of choosing cards with letters only? orange A X e What fraction shows the chance of choosing cards with symbols only? A X f Circle the correct ending to this sentence: The pair of cards that should score 00 points because they are the least likely to be turned over are: symbol/letter letter/symbol letter/letter symbol/symbol F

7 Chance and probability chance experiments Before we conduct a chance experiment, we need to work out what all the possible outcomes are. This helps us to look at how likely a particular outcome is and if the results are surprising or not. To do this, we can use a tree diagram. We count the boxes at the end of the diagram to find the total number of options. Lisa is ordering her lunch from the canteen. She has a choice of white bread or brown bread, lettuce or tomato, tuna or ham. a Complete this tree diagram to show all of her options: white bread lettuce tuna ham brown bread b How many different sandwich combinations does Lisa have to choose from? Three coins are tossed together. a Fill in this tree diagram to work out all the combinations that are possible when coins are tossed. st coin nd coin rd coin H T b Follow the tree branches to find out the possibility of throwing: heads tails heads, tail head, tails F

8 Chance and probability chance experiments In the last activity, you completed a tree diagram showing all the possible outcomes of a toss of coins. There are 8 different ways that the coins can land. This is known as theoretical probability. Sometimes we refer to this as the odds as in, the odds were against them or he beat the odds. Theoretical probability is what we expect to happen on paper, but in real life, events don t always occur that way. The theoretical probability of the coins landing on HHH is out of 8. So if I toss coins 8 times, I can say I should get HHH once and only once. But does this really happen? Fill in the sentences to show the theoretical probability: a If I toss coins in the air 8 times, HHH should appear. once b So if I toss coins in the air 6 times, HHH should appear. c If I toss coins in the air times, HHH should appear of 8 = of 6 = of = Now try it out. Work with a partner and throw coins in the air, times. Record your results: Possibility H H H H H T H T T H T H T T T T T H T H H T H T Throws What happened? How many HHH landed? Was it the same as the theoretical possibility? 6 Try it again. Are your results the same or different? Possibility H H H H H T H T T H T H T T T T T H T H H T H T F Throws

9 Chance and probability fair or unfair When everyone has the same chance of winning a game or competition, it is fair. It is unfair when everyone does not have the same chance of winning. For example look at the cards above. Jack wins if he draws a card with a smiley, Jo wins if she draws a card with a heart shape on it. Do both players have the same chance of winning? Circle the correct statement: Yes this is fair No this is unfair Jess and Sam play a game with spinners where they each spin their spinner times and add up all the numbers. The person with the biggest total wins Jess spinner Sam s spinner a Is this fair or unfair? b Explain why: You are playing a game using a spinner and cubes. You are given a cube randomly and then the spinner is spun. If it lands on your colour cube, you are out. Colour the cubes to make the game fair. White White Blue Yellow Red Red Green Red Matty invented a card game for players where each player has cards and turns them over face down. Players then draw a card at the same time. If it has dots you win a point. What should Player s cards look like to make the game fair? Player s cards Player s cards F 7

10 Chance and probability fair or unfair A game of chance for two players You will need: Two six-sided dice and two counters. How to play: Each player places a counter on their own Start space. The players take turns to roll both dice and calculate the difference between the two numbers they roll. Player moves UP a space when the difference is 0, or. Player moves DOWN a space when the difference is, or. Player moves DOWN a space when the difference is 0, or. Player moves UP a space when the difference is, or. The players keep taking turns. The first player to get to Home is the winner. Player _ Start Home Player Start Use this grid to work out the pairs of numbers that could be rolled using two dice and the differences between them. _ Colour the 0, and differences. Circle the, and differences a Is the game above fair? What did you notice? b How could this game be improved? 8 F

11 The Mathletics Cup create Getting ready You and a partner will use this game board to create a game. In your game, each player will choose to be character. There needs to be at least players. The players will take turns rolling two dice, then adding the faces together. If the answer matches the number of their character, they move forward one space. The first person to the finishing line, wins. What to do Your job is to create a fair game by assigning the numbers to to the characters. Write the number clearly in the circle next to the character. How will you decide which number to place where? You may use each number once and only once. For example, you can make Marcia 7. If you choose to be Marcia, every time you roll a 7, you can move. If you roll any other number, you will have to sit. Mike Marcia Jan Peter Cindy Alice Bobby Greg FINISHING LINE Susan Sam Carol What to do next Play your game with another pair. Does it work? Is it fair? Does the other pair agree with you? Now play their game. Have them set it up differently. Is one game fairer than the other? Choose one game board and play the best out of three games. F 9

12 Greedy pig solve Getting ready This is a famous game. It s played with the whole class. Your teacher will need a die and you will need your own tally board set up like this: Game Numbers Score Total What to do Everyone in the class stands up. Your teacher will roll the die 0 times. You write down the numbers as they are rolled these will count towards your score. The trick is that if a is rolled, you lose all your points and you are out of the game. You may sit down at any stage and keep your points but you may not stand up again in the same game. The choice is up to you! The game goes on until the die has been rolled 0 times or everyone is sitting down. Play games. What is your total score? Did you develop a strategy as the games went on? What to do next Discuss your strategy with the class. When do you choose to sit down and why? After listening to the strategies of others, play games again. Does your score improve? The theoretical probability of rolling a is in 6. How does that pan out in real life? Is a rolled once every 6 throws? Why or why not? 0 F

SERIES Chance and Probability

F Teacher Student Book Name Series F Contents Topic Section Chance Answers and (pp. Probability 0) (pp. 0) ordering chance and events probability_ / / relating fractions to likelihood / / chance experiments

Chance and Probability

Series Student Chance and Probability My name F Copyright 009 P Learning. All rights reserved. First edition printed 009 in Australia. A catalogue record for this book is available from P Learning Ltd.

Chance and Probability

G Student Book Name Series G Contents Topic Chance and probability (pp. ) probability scale using samples to predict probability tree diagrams chance experiments using tables location, location apply lucky

Chance and Probability

Student Teacher Chance and Probability My name Series G Copyright 009 P Learning. All rights reserved. First edition printed 009 in Australia. A catalogue record for this book is available from P Learning

Probability. Sometimes we know that an event cannot happen, for example, we cannot fly to the sun. We say the event is impossible

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