Use the formula: z = (x – μ) / σ
Identify x, the individual value
Identify μ, the mean
Identify σ, the standard deviation
Subtract the mean from the value: x – μ
Divide the result by the standard deviation: (x – μ) / σ
The result is the z score
If given a sample mean and sample standard deviation, use z = (x – x̄) / s
If solving for x, use x = μ + zσ