A z-score measures exactly how many standard deviations above or below the mean a data point is. Here's the formula for calculating a z-score: Here's the same formula written with symbols:
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Things to Remember Z score is a statistical measurement tool used to determine the distance of a raw score from the mean through standard Z score can be positive
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A z score is simply defined as the number of standard deviation from the mean. The z-score can be calculated by subtracting mean by test value and dividing it by standard value. So, z = (x − μ)/ σ Where x is the test value, μ is the mean and σ