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1. For **Windows** or **Linux** - Press **Ctrl+D**

2. For **MacOS** - Press **Cmd+D**

3. For **iPhone (Safari)** - **Touch and hold**, then tap **Add Bookmark**

4. For **Google Chrome** - Press **3 dots** on top right, then press the **star sign**

1
### Step 1

Enter your set of numbers in the input field. Numbers must be separated by commas.

2
### Step 2

Press Enter on the keyboard or on the arrow to the right of the input field.

3
### Step 3

In the pop-up window, select “Find the Standard Deviation of the Frequency Table”. You can also use the search.

Number of standard deviations from the mean is also called Z-score (Standard score) is a measure of the relative spread of an observed or measured value, which shows how many standard deviations make up its spread of the relative average value. This is a dimensionless statistical indicator used for comparing values of different dimensions or scales of measurements.