which values are used to find the mean for grouped data
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To calculate the mean of grouped data, the first step is to determine the midpoint (also called a class mark) of each interval, or class. These midpoints must then be multiplied by the frequencies of the corresponding classes. The sum of the products divided by the total number of values will be the value of the mean...
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If data is organised into groups, we do not know the exact value of each item of data, just which group it belongs to. This means that we cannot find the exact value for the mode, median or mean. ... We can find an estimate for the mean by using the mid-values of the groups
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