Answer :
The weighted mean for three exams is 78.1%.
Define weighted mean.
The weighted mean is a form of mean that is computed by averaging all the products after multiplying the weight (or probability) connected to a specific event or result by its connected quantitative outcome. The difference between the weighted arithmetic mean and a regular arithmetic mean is that certain data points contribute more to the final average than others, as opposed to all data points contributing equally. In mathematics, the average value of the data is determined using the weighted mean. When calculating the weighted mean, the average value can be determined by giving various weights to some of the individual variables.
Given,
Weighted mean for student:
Weights = 155
∈x₁ w₁/∈w₁
121/155 × 100%
78.045%
78.1%
The weighted mean for three exams is 78.1%.
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