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Unformatted text preview: 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Created by Mr. Lafferty 1 Statistics Statistics Average (Mean), Range Frequency Tables Pie Charts www.mathsrevision.com Line Graphs Constructing Pie Charts 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Created by Mr. Lafferty 2 www.mathsrevision.com Level E Lesson Starter Q1. Write down the highest and lowest number in this set of numbers. Q2. Add 2.34 + 5.03 + 7.2 Q3. Find x to make this expression true. 52, 55, 62, 51, 59, 62, 52, 59, 61, 55 8 20 2 x + = 13 Feb 2012 13 Feb 2012 Created by Mr. Lafferty Created by Mr. Lafferty 3 www.mathsrevision.com Level E Aims of the lesson 1. Explain the meaning of the keywords Mean and Range 2. Calculate the mean and range for given data. 13 Feb 2012 Created by Mr. Lafferty 4 Finding the range The range of a set of data is a measure of how the data is spread across the distribution. To find the range we subtract the lowest value in the set from the highest value. Range = highest value lowest value When the range is large; the values vary widely in size. When the range is small; the values are similar in size. 13 Feb 2012 Created by Mr. Lafferty 5 Here are the high jump scores for two girls in metres. Joanna 1.62 1.41 1.35 1.20 1.15 Kirsty 1.59 1.45 1.41 1.30 1.30 Find the range for each girls results and use this to find out who is consistently better. Joannas range = 1.62 1.15 = 0.47 Kirs tys ra ng e = 1.59 1.30 = 0.29 The ra ng e 13 Feb 2012 Created by Mr. Lafferty 6 The mean The mean is the most commonly used average . To calculate the mean of a set of values we add together the values and divide by the total number of values . For example, the mean of 3, 6, 7, 9 and 9 is 3 + 6 + 7 + 9 + 9 5 3 4 5 = 6 .8 = Mean = Sum of values Number of values 13 Feb 2012 Created by Mr. Lafferty 7 Two dice were thrown 10 times and their scores were added together and recorded. Find the range and mean for this data. 7, 5, 2, 7, 6, 12, 10, 4, 8, 9 Mean Rang e 12 2 = 7 + 5 + 2 + 7 + 6 + 12 + 10 + 4 + 8 + 9 10 = 7 0 10 = 10 = 7 = h igh e s t  lowe s t = 13 Feb 2012 Created by Mr. Lafferty 8 Here are some 1500 metre race results in minutes. It may be appropriate in research or experiments to remove an extreme value before carrying out analysis of results. 6.26 6.28 6.30 6.39 5.38 4.54 10.59 6.35 7.01 Are there any extreme values?...
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This note was uploaded on 02/13/2012 for the course MATH 116 200 taught by Professor Janet during the Spring '11 term at University of Phoenix.
 Spring '11
 janet

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