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In statistics, n is usually used to mean the number of observations or measurements which you have. So n = 7 means you have 7 observations or meadurements.
If something is referring to the N sides, it could mean the north side. This refers to a direction. However, it may depend on the subject or context this is used.
CT is the abreviation for carats. This weighing unit is used for weighing diamonds and other gemstones.
Mean = (sum of the n numbers)/n
n=6