It means non- applicable
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N is neither the sample or population mean. The letter N represents the population size while the small case letter n represents sample size. The symbol of sample mean is x̄ ,while the symbol for population mean is µ.
The geometric mean of n numbers (t{1}, t{2}, ..., t{n}) is given by (Π t{n})^(1/n) → geometric mean of 8.5 and 12.4 = (8.5 × 12.4)^(1/2) = 10.26645... ≈ 10.266
N in shoe size stands for Narrow.
6
If you mean: n/5 = 64/40 then the value of n is 8