Estimate the mean using grouped results

Measuring and comparing data

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 midpoint of each interval is used and the implications for the answer. Calculate or interpret the sum of the frequency multiplied by the midpoint. 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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