# EDEXCEL FUNCTIONAL SKILLS PILOT. Maths Level 2. Chapter 7. Working with probability

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1 Working with probability 7 EDEXCEL FUNCTIONAL SKILLS PILOT Maths Level 2 Chapter 7 Working with probability SECTION K 1 Measuring probability Experimental probability Using tables to find the probability of combined events Using tree diagrams to show the outcomes of combined events Remember what you have learned 117 Pearson Education 2008 Functional Maths Level 2 Chapter 7 Draft for Pilot

2 EDEXCEL FUNCTIONAL SKILLS PILOT Maths Level 2 Su Nicholson Draft for pilot centres Chapter 1: Working with Whole Numbers Chapter 2: Working with Fractions, Decimals & Percentages Chapter 3: Working with Ratio, Proportion, Formulae and Equations Chapter 4: Working with Measures Chapter 5: Working with Shape & Space Chapter 6: Working with Handling Data Chapter 7: Working with Probability Chapter 8: Test preparation & progress track How to use the Functional mathematics materials The skills pages enable learners to develop the skills that are outlined in the QCA Functional Skills Standards for mathematics. Within each section, the units provide both a summary of key learning points in the Learn the skill text, and the opportunity for learners to develop skills using the Try the skill activities. The Remember what you have learned units at the end of each section enable learners to consolidate their grasp of the skills covered within the section. All Functional Skills standards are covered in a clear and direct way using engaging accompanying texts, while at the same time familiarising learners with the kinds of approaches and questions that reflect the Edexcel Functional Skills SAMs (see edexcel.org.uk/fs/ under assessment ). The Teacher s Notes suggest one-to-one, small-group and whole-group activities to facilitate learning of the skills, with the aim of engaging all the learners in the learning process through discussion and social interaction. Common misconceptions for each unit are addressed, with suggestions for how these can be overcome. One important aspect of Functional mathematics teaching is to ensure that learners develop the necessary process skills of representing, analysing and interpreting. The inclusion of Apply the skills in the Teacher s Notes for each section, aims to provide real-life scenarios to encourage application of the skills that have been practised. To make the most of them, talk through how the tasks require the use of the skills developed within the section. The tasks can be undertaken as small-group activities so that the findings from each group can be compared and discussed in a whole-group activity. The scenarios can be extended and developed according to the abilities and needs of the learners. As part of the discussion, learners should identify other real-life situations where the skills may be useful. Published by Pearson Education, Edinburgh Gate, Harlow CM20 2JE Pearson Education 2008 This material may be used only within the Edexcel pilot centre that has retrieved it. It may be desk printed and/or photocopied for use by learners within that institution. All rights are otherwise reserved and no part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanic, photocopying, recording or otherwise without either the prior written permission of the Publishers or a licence permitting restricted copying in the United Kingdom issued by the Copyright Licensing Agency Ltd, Saffron House, 6 10 Kirby Street, London EC1N 8TS. First published Typeset by Oxford Designers & Illustrators, Oxford Draft for Pilot Functional Maths Level 2 Chapter 7 Pearson Education 2008

3 Working with Ratio, Proportion, Formulae and Equations 3 K Working with probability You should already know how to: use probability to show that some events are more likely to occur than others. By the end of this section you will know how to: use a numerical scale from 0 to 1 to express and compare probabilities identify the range of possible outcomes of combined events and record the information in tree diagrams or tables. 1 Measuring probability Learn the skill Probability is regularly used as part of everyday life. Questions such as: What are the chances of winning the lottery? What is the likelihood of rain today? What are the odds on Manchester United winning the European Cup? all involve probability and answers can be calculated if you are given sufficient background information. Probability is the chance, or likelihood, that a certain event might happen. The probability of an event happening lies between 0 and 1 Probabilities can be measured in fractions, decimals or percentages Probability of an event = Number of ways the event can happen Total number of possibilities Remember If an event is certain the probability is 1, if an event cannot happen the probability is 0. For example, when throwing a die Prob(getting a number between 1 and 6) = 1. Prob(getting a 7) = 0. Example 1: What is the probability that a person chosen at random was born in April? Give your answer as a fraction in its lowest terms. There are 365 days in a year and 30 days in April, so the probability is = Remember Fractions should be written in their lowest terms. Pearson Education 2008 Functional Maths Level 2 Chapter 7 page 109 Draft for Pilot

4 The probability of an event happening + probability of an event not happening = 1 (or 100%) Example 2: The probability that it will rain tomorrow is 0.4. What is the probability it will not rain tomorrow? The sum of the probabilities is 1 so that the probability it will not rain tomorrow = = 0.6 Answer: 0.6 The sum of the probabilities of all possible outcomes equals 1 (or 100%) Example 3: There is a 60% chance that a football team will win their next match. The probability that they will lose is 30%. What is the probability they will draw their next match? When a football match is played there are three possible outcomes; win, lose or draw so the sum of the probabilities must be 100%. As 60% + 30% = 90%, this means the probability of a draw = = 10%. Answer: 10% Try the skill 1. There are 20 female and 12 male students in a psychology group. What is the probability that a student chosen at random will be male? Give your answer as a fraction in its lowest terms. 2. A Mori Poll showed the probability that Labour will win the next General election was 34%. What was the probability that Labour will not win the next General election? 3. A survey into train reliability showed that the probability the London to Manchester train was on time was and the probability the train was early was What was the probability the train was late? Draft for Pilot Functional Maths Level 2 Chapter 7 page 110 Pearson Education 2008

5 Working with probability 7 2 Experimental probability Learn the skill Experimental probability is calculated from the results of an experiment. The manufacturing industry uses experimental probability to assess the reliability of their products, so that they can inform their customers and use in advertising. Example: A quality control engineer at Glow-Right Bulbs factory tested 400 bulbs and found 6 bulbs defective. What is the experimental probability that the bulbs are defective? If 6 out of the 400 tested are defective, then you can say: Probability a bulb is defective = = (or as a decimal). The probability can also be expressed as a percentage: = 1.5%. This means that in any sample of bulbs, you would expect 1.5% to be defective. Answer 1.5% Remember To change a fraction or decimal to a percentage you multiply by 100. Tip The probability the bulb is not defective is = Or % = 98.5% Try the skill 1. A clothing company finds that 12 in every 200 pairs of jeans do not meet their quality standards. What is the experimental probability that a pair of jeans does not meet the quality standards? out of every 1000 cars tested in 2004/5 failed the MoT test the first time they were tested. What is the experimental probability that a car will fail the first MoT test? 3. A retailer samples 3 bags of Best Buy sweets to check the consistency of the number of different varieties of sweets in a bag. Bestbuy 400 g Bag no. Variety Devon Mint Rum & Coconut Banana Butter Total Pearson Education 2008 Functional Maths Level 2 Chapter 7 page 111 Draft for Pilot

6 a Use the table to work out the probability of getting more than 50 sweets in a bag. b Complete the table below to show the probability of selecting each variety of sweet from each bag as a percentage, to the nearest whole number. For example, the probability of getting a Devon sweet in bag 1 is = 19.6% i.e. 20% % Bag no. Variety Bestbuy 400 g Devon Mint Rum & Butter c Use the probability table to decide which variety of sweet is the most inconsistent i.e. has the largest variation in probability. Coconut Banana Draft for Pilot Functional Maths Level 2 Chapter 7 page 112 Pearson Education 2008

7 Working with probability 7 3 Using tables to fi nd the probability of combined events Learn the skill Two events are said to be independent if the first has no effect on the second. For example, when throwing dice, the number you get on the first throw has no effect on the number you get on the second throw. Tables can be used to show all the possible outcomes of two combined events. Many games involve the use of two dice and you need to be able to consider whether or not they are fair. To do this you should look at all the possible outcomes, which can be easily set out in a table and work out the probabilities. Example: A game involves throwing a pair of dice and multiplying the two numbers together to find the score. If the number is odd you score a point, if the number is even you lose a point. The dice are thrown 20 times. If you have a positive number of points at the end of 20 throws you win. Is the game fair? You first need to set up a table to show all the possible outcomes from throwing the two dice. Score on 2nd Score on 1st dice The table shows there are 6 6 = 36 possible outcomes. Of those 36 outcomes, 9 are odd and 27 are even, (highlighted in yellow). Probability of getting an odd number = 9 36 = 1 4 Probability of getting an even number = = 3 4 Out of 20 throws of the dice you would expect to get: = 5 odd numbers scoring 5 points = 15 even numbers scoring 15 points Total expected number of points at the end of 20 throws = 5 15 = 10 Answer: the game is not fair Tip Total is either odd or even so: Prob(odd) + prob(even) = 1 Pearson Education 2008 Functional Maths Level 2 Chapter 7 page 113 Draft for Pilot

8 Try the skill 1. A game involves throwing a pair of dice and adding the scores. a Complete the table to show the possible scores. 2nd dice st dice b Calculate the probabilities for each of the possible scores. c What do you notice about the sum of the probabilities of all the possible scores? d What is the most likely score? e What is the probability of getting a score more than 8? f What is the probability of getting a score which is an even number? 2. Another game involves tossing two coins. H = throw heads T = throw tails a Complete the table to show all the possible outcomes when 2 coins are tossed. b What is the probability of getting a head and a tail? 2nd coin 1 2 1st coin H T c What is the probability of both coins showing the same face? 3. Football teams in the premier league play fixtures at home and away. The result can be win (W), lose (L) or draw (D). a Complete the table to show all the possible outcomes when a football team plays a home and away fixture. b The football team scores 3 points for a win, 1 point for a draw and 0 points if they lose. Complete the table below to show the points for each possible outcome. Away W L D Home H L D Away W L D Home W L D c If it is equally likely that the football team wins, loses or draws, work out the probabilities of obtaining each of the possible scores. Draft for Pilot Functional Maths Level 2 Chapter 7 page 114 Pearson Education 2008

9 Working with probability 7 4 Using tree diagrams to show the outcomes of combined events Learn the skill Tree diagrams can be used to show the outcomes of combined events. Example 1: A couple have two children. Draw a tree diagram to show all the possible outcomes for the gender of the two children. If they have two children the gender of the first child has no effect on the gender of the second and so the events are independent. Let B = boy and G = girl. 1 st child 2 nd child outcomes GG G G B GB B G BG If a couple have a child it is equally likely to be a boy or a girl. B BB Probability of having a boy = 1 2 Probability of having a girl = 1 2 There are four possible outcomes and all are equally likely. GG means girl then girl GB means girl then boy BG means boy then girl BB means boy then boy. Two out of the four outcomes mean the couple have a boy and a girl. In one the girl is born first and then the boy (GB), in the other the boy is born first, (BG). This means you would expect that for couples who have two children: half will have a boy and a girl a quarter will have two boys a quarter will have two girls Pearson Education 2008 Functional Maths Level 2 Chapter 7 page 115 Draft for Pilot

10 Try the skill 1. Complete the tree diagram to show all the possible outcomes when two coins are tossed. Let H = throw heads and T = throw tails. 1 st throw 2 nd throw outcomes H H T 2. When a football team plays a match, they can either win( W), lose (L) or draw D). Complete the tree diagram below to show all the possible outcomes when a football team plays a home and away fixture against another team. home game away game outcomes W L D Draft for Pilot Functional Maths Level 2 Chapter 7 page 116 Pearson Education 2008

11 3. Complete the tree diagram below to show all the possible outcomes when a couple have 3 children. Working with probability 7 1 st child 2 nd child 3 rd child outcomes G G B Pearson Education 2008 Functional Maths Level 2 Chapter 7 page 117 Draft for Pilot

12 5 Remember what you have learned First complete this The probability of an event happening lies between Probabilities can be measured in, or Probability of an event = Prob (event happens) prob ( event doesn t happen) = or The sum of the probabilities of all possible outcomes = and probability is calculated from the results of an experiment. Two events are said to be independent if the probability of has no effect on Tables can be used to show all the possible outcomes of events Tree diagrams can be used to show the possible outcomes of or combined Use the skill 1. An athlete is predicted to have a 1 in 8 chance of winning a race. What is the probability the athlete does not win the race? A. 12.5% B. 18% C. 62.5% D. 87.5% 2. An Ipod stores songs by four different artists. When on shuffle, the probability the Ipod plays songs by artist 1 is 0.41, by artist 2 is 0.23 and by artist 3 is What is the probability the Ipod plays a song by artist 4? A. 0.2 B C D In a group of students, 32 travel to college by bus, 12 travel by train and 16 walk to college. What is the probability a student chosen at random travels to college by train? A. 1 5 B. 1 4 C D In 2003 the number of live births in the UK by gender was: Male Female Total a Calculate the experimental probability that a baby born in the UK is a male b Calculate the experimental probability that a baby born in the UK is a female c What do you notice about your answers to (a) and (b)? Draft for Pilot Functional Maths Level 2 Chapter 7 page 118 Pearson Education 2008

13 5. A game involves throwing two 8 sided poly-dice and adding the numbers to get the score. a Complete the table to show all the possible outcomes from throwing the two poly-dice. Working with probability 7 2 nd dice st dice b How many possible outcomes are there? c Use the table to find the most likely score. d What is the probability of scoring a number less than 10? 6. The probability that the train travelling between Manchester and London in either direction is on time, (OT) is and the probability it is early, (E) is a What is the probability it is late, (L)? b Complete the tree diagram to show all possible outcomes for a return trip between London and Manchester. Manchester to London London to Manchester outcomes OT L E Pearson Education 2008 Functional Maths Level 2 Chapter 2 page 119 Draft for Pilot

14 7. The long range weather forecast predicts a 12% chance of rain, (R), on any day in June. a What is the probability that it will not rain, (NR), on any day in June? A theatre company plans to put on an open air play in June. b Complete the tree diagram to show all the possible outcomes for the weather for the 3 days. day 1 day 2 day 3 outcomes R R NR Draft for Pilot Functional Maths Level 2 Chapter 7 page 120 Pearson Education 2008

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