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IQ is distributed normally, with a mean of 100 and a standard deviation of 15. The z-score of 100 is therefore:(value-mean)*standard deviation= (100-100)*15= 0More generally, a raw score that is equivalent to the mean of a normal distribution will always have a z-score of 0.
0
If you mean on the axis where it has /\/ to skip from for example 0 to 100, 110, 120 because there is no need for the 0-100 then it's called a broken axis.[ Tilde ~ ]
100%
75 - 100 + 0 = -25