It can be negative, zero or positive.
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Correct.
if it didn't equal zero then what else would it equal
A scalene triangle has zero equal sides.
The Greek word "kurtosis", when translated to English, means the probability theory of any measure of the "peakedness" of a real valued random variable.
When the numerator of any expression or fraction is zero then the result is zero because zero divided by any number is always equal to zero.