NORM.S.DIST Returns the standard normal distribution (has a mean of zero and a standard deviation of one).
Z – The value for which you want the distribution.
Cumulative – Cumulative is a logical value that determines the form of the function. If cumulative is TRUE, NORM.S.DIST returns the cumulative distribution function; if FALSE, it returns the probability density function.
The standard normal distribution (has a mean of zero and a standard deviation of one.