# How to calculate Z-scores in Excel

### Graphic skills

To describe a value's relationship to the mean of a group of values , sometimes we need to calculate Z-scores. The formula used to calculate a Z-score is** Z=(x-µ)/σ**, where

· **x** is the value that needs to be standardized

· **μ** is the mean of the given dataset

· **σ** is the standard deviation of the given dataset

Here are the steps.

1. Here we have a set of data that simulates the sales of coffee. Before calculating the Z-scores, we must calculate the mean and standard deviation of given data by using **AVERAGE **and **STDEVPA **formulas respectively.

2. Then we can calculate the Z-scores with the formula demonstrated above (**Z=(x-µ)/σ**). For example, we can calculate the Z-score of the sales of Americano, which is 244. So the Z-score in C2 will be** =(B2-B9)/B10, **which is -0.75733.

3. Now we can copy the formula down to calculate the Z-scores of the remaining values. Before this, remember to lock the cells containing mean and standard deviation by entering a **$** symbol before the column letter and row number. Or you can select the cells in the formula and press **F4 **as a shortcut. Now click and drag the formula down to complete the calculations automatically.

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