Estimate the mean using grouped results

Measuring and comparing data


Calculate an estimate of the mean from a grouped frequency table or equivalent representation showing the frequency of each class interval e.g. a bar chart or cumulative frequency table. Understand why the mid-point of each interval is used and the implications for the answer. Calculate or interpret the sum of the frequency multiplied by the mid-point. Complete a third row in the frequency table to show the separate calculations. Understand that the mean need not be one of the actual results e.g. it can be a decimal. Round the estimated mean to a sensible degree of accuracy. Include using a simple coded/assumed mean
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