In statistics, letter such as; a,..x..,z, is a variable used to represent an unknown value.
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z = (x - mean of x)/ std dev of x I thought this website was pretty good: http://www.jrigol.com/Statistics/TandZStatistics.htm
Probability is used to answer questions in the category of Statistics. Probability is a basic statistic that gives numeric value to the questions; Will a specific event occur? or How certain are you that it will occur. Probability of rolling a 3 on a 6-sided die is 1/6.
There is none just use M x(~)- the tilde is above the x
_x?That's the average.sum of all x divided by nx
z=x-mean / sd