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Statistics

Tuesday, 07 January 2020. Statistics. a) Be able to find the averages called: MODE, MEDIAN & MEAN b) Be able to find the RANGE c) Know which is the best average to use for a given situation. Statistics. The MODE The most common number or item .

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Statistics

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  1. Tuesday, 07 January 2020 Statistics a) Be able to find the averages called: MODE, MEDIAN & MEAN b) Be able to find the RANGE c) Know which is the best average to use for a given situation.

  2. Statistics The MODE The most common number or item. The MODE of 2, 3, 4, 6, 3, 5, 3, 4, 7, 3 is3 The data has been put into a GROUPED frequency chart. 2 – 4 is the MODAL group

  3. The MEDIAN The middle number • To find the median of a) 2, 3, 3, 7, 8, 12 , 8 , 3 , 6 • b) 2, 3, 3, 7, 8, 12 , 8 , 3 , 6 , 10 • Put the numbers into rank order • 2, 3, 3, 3, 6, 7, 8, 8, 12 • Find the centre number(s) • 2, 3, 3, 3, 6, 7, 8, 8, 10, 12 • If there are two numbers at the centre • 2, 3, 3, 3, 6, 7, 8, 8, 10, 12 add these together and divide by 2 • (6 + 7) ÷ 2 = 13 ÷ 2 = 6.5

  4. The MEAN Add all the numbers together and then divide by the number of numbers. To find the mean of 3, 3, 6, 8, 1, 4, and 9 3 + 3 + 6 + 8 + 1 + 4 + 9 = 34 34 ÷ 7 = 4.86 The RANGE This is the difference between the smallest and largest numbers. The RANGE of 3, 3, 6, 8, 1, 4, and 9 is 9 – 1 = 8 There are 7 numbers

  5. In each of the following questions, explain why you would use the MODE, MEDIAN or MEAN average • The GCSE results for a group C C C C D D D B D C C C • The wages of 10 people working in an office £150 £180 £190 £330 £120 £240 £450 £500 £125 £270 • The average height of a group of people • The average amount of money spent by a Year 9 student during the weekend 5) The average number of days in a month

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