To convert any bell curve into a standard bell curve, we use the above formula. Let *x* be any number on our bell curve with mean, denoted by mu, and standard deviation denoted by sigma. The formula produces a *z*-score on the standard bell curve.

*x* be any number on our bell curve with mean, denoted by mu, and standard deviation denoted by sigma. The formula produces a *z*-score on the standard bell curve.