## Instruction of online calculator

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Welcome to the area under the standard normal distribution calculator by **ONLINE**! In the following, we are focusing on how to calculate the** area under standard normal distribution**.

The total area under the standard normal distribution curve is 1. Therefore, if we have a Z value, i.e., how far a value is above or below the mean (0), we can determine the probability of a value less than or greater than that.

Here are the steps you need to follow:

- Specify the
**Z**. - Set the decimal digit as you require.
- The
**area under the standard normal distribution, A,**will then be calculated correspondingly.

The figure below shows the relationship between the above parameters.

**Example:** Calculate the area under of standard normal distribution before Z=-2. It is shown by A. the decimal digit is 4. The following figure shows the value of shaded area.

The A=0.0228 displays on output box. The concept of this calculation is shown below.