4.1: Mean - Weighted Arithmetic Mean

There are sets of values where the values or measurements involved have different “weights” or degree of importance. The mean of this set is called a “weighted mean.” The formula for computing a weighted mean is as follows:

where:
= mean
x = measurement or value
W = weight

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Sample Mean - mean of ungrouped or raw data

where:
= mean
Σx = sum of all the measurements
n = number of measurements

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