Averaging Base-4 Percentages

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I have 15 base-4 numbers (0-3) representing 0%, 33%, 66%, and 99% which I want to average. Is it a valid statement that if I convert the base-4 numbers to their associated % and find the average, that final average will represent the average-%?

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If I understand your question correctly, you have a mapping from $(0,1,2,3)$ to $(0\%,33\%,66\%,99\%)$, respectively, and this is a linear mapping. That implies that the mapping preserves averages. For example, if you had instead, three numbers $(1,2,3)$, the average is $2$ which maps to $66\%$ and this is also the average of $(33\%,66\%,99\%)$.