N in shoe size stands for Narrow.
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M means medium, and is a reference to the width of the shoe, not the actual size.
it means that the 10 is the size and c is the wight.
Wide
4.5
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.