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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 2 Standard Deviation Range”. You can also use the search.

The expected value, the average value of a random variable is one of the numerical characteristics of the probability distribution of a random variable. The average characterizes the location of the values of a random variable. This role of average value is fully explained by the law of large numbers.