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Published byRene Lansdown Modified over 2 years ago

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

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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.

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like this Number of letters per dayfrequency 5 2 3 3 4 2

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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.

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The total number of letters is given by Number of letters per day frequencyLetters x frequency 25 32 43 2 x 5 = 10 3 x 2 = 6 4 x 3 = 12 Total letters = 28

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and the total number of days is Number of letters per day frequencyLetters x frequency 25 32 43 2 x 5 = 10 3 x 2 = 6 4 x 3 = 12 Total letters = 28days = 10

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

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