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Finding the mean

Finding the mean. of a set of numbers. A mean. is one of three types of average. The others are the median and the mode. The mean is the sum of the values divided by the number of values. Here is a set of 6 numbers 10 3 11 8 15 13.

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Finding the mean

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  1. Finding the mean of a set of numbers

  2. A mean • is one of three types of average. • The others are the median and the mode. • The mean is the sum of the values divided by the number of values.

  3. Here is a set of 6 numbers10 3 11 8 15 13

  4. To find the mean we add the numbers and divide by 6. 10 + 3 + 11 + 8 + 15 + 13 = 60 The mean is 10  60 6 = 10

  5. Notice that if we add 5 to each number10 3 11 8 15 13+ 5 become15 8 16 13 20 18

  6. The mean of the new numbers increases by 5. 15 + 8 + 16 + 13 + 20 + 18 = 90 The mean is 15  15 90 6 =

  7. Unlike the median the mean is influenced by extreme values. 10 3 11 8 15 13

  8. If we replace 13 by 613. 10 3 11 8 15 613 13 The mean becomes 110.

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