Frequency Tables

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When a lot of data has to be represented it can be put into a frequency table

EG. This table shows how many times students in a form were late in a week

Number Of Times Late 0 1 2 3 4 5

Frequency 11 8 3 3 3 2

Find the mode - looking for the data with the highest frequency

Find the median - adding up all the frequencies of the data items, in order, until the half-way pint of all the data in the set it passed

Find the mean - multiplying the value of each data item by its frequency, adding the totals, then dividing by the total of all the frequencies

REMEMBER

- THE MODE IS THE VALUE THAT HAS THE HIGHEST FREQUENCY, IT IS NOT THE FREQUENCY ITSELF

- IN EXAMS, DATA IS USUALLY GIVEN IN VERTICAL TABLES. ADD ANOTHER COLUMN TO WORK OUT x X F (VALUE MULTIPLIED BY THE FREQUENCY)

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