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Means from Frequency Tables

Means from Frequency Tables. A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project. To find the mean number of letters you receive per day. You might keep a record for 10 days of the number of letters you receive each day,

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Means from Frequency Tables

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  1. Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project.

  2. To find the mean number of letters you receive per day • You might keep a record for 10 days of the number of letters you receive each day, • and summarise the results in a table.

  3. like this 2 3 4

  4. To find the mean it is important • to remember you want the average number of letters per day. • So need the total number of letters, • and total number of days.

  5. The total number of letters is given by 2 x 5 = 10 3 x 2 = 6 4 x 3 = 12 Total letters = 28

  6. and the total number of days is 2 x 5 = 10 3 x 2 = 6 4 x 3 = 12 days = 10 Total letters = 28

  7. days = 10 letters = 28 • The mean is 28 Total letters = = 2•8 10 Total days The mean is 2•8 letters per day

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