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Estimated Mean Presentation
This document describes how to estimate the mean of a data set that has been grouped into intervals. The key steps are: 1) Assign a midpoint value to each interval based on the lowest and highest values. 2) Multiply the midpoint by the frequency to get the contribution of each interval. 3) Sum all the interval contributions and divide by the total frequency to estimate the mean. Following these steps on the sample height data estimates the mean height as 141.02cm.
