Z-Score Practice Problems

A z-score tells you how many standard deviations away an individual data value falls from the mean. It is calculated as:
z-score = (x – μ) / σ
x: individual data value
μ: population mean
σ: population standard deviation
This tool automatically generates z-score practice problems and provides solutions.

The height of plants in a certain garden are normally distributed with a mean of 12.3 inches and a standard deviation of 4.1 inches.
Calculate the z-score of a plant that is 13.5 inches tall. Round to two decimal places.

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