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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**

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### Step 1

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

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### Step 2

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

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### Step 3

In the pop-up window, select “Find the Probability Using Standard Deviation”. You can also use the search.

It really depends on the type of distribution you have. Assuming that your data set is approximately normally distributed, you can take a point estimate and calculate your z-score, where z = (x - x ∗) / σ and x is your point estimate, x * is your average, and σ - your standard deviation.

Using your z score, you can see this in the cumulative distribution function φ (x), where φ (z) = P. There are Excel functions and tables that show a list of values for z and their values in CDF If your data generally does not diffuse, you must take into account the asymmetry, excess and the like.