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Statistics - PowerPoint PPT Presentation


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Saturday, 24 May 2014. Statistics. a) Be able to find the averages called: MODE, MEDIAN & MEAN b) Be able to find the RANGE. Statistics. The MODE The most common number or item . The MODE of 2, 3, 4, 6, 3, 5, 3, 4, 7, 3 is 3.

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slide1

Saturday, 24 May 2014

Statistics

a) Be able to find the averages called:

MODE, MEDIAN & MEAN

b) Be able to find the RANGE

slide2

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

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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
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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