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# InvNorm Calculator

Probability: Add the area (between 0 and 1) to find the unknown statistical values.

Mean:

Standard Deviation:

Table of Content

 1 Inverse Normal Formula: 2 Inverse Normal Probability on a TI-83 or TI-84 Calculator: 3 Inverse Normal in Excel: 4 What is the Difference Between Inverse Gaussian Distribution and Inverse Normal Distribution: 5 How do I know if my data is normally distributed?

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An online invnorm calculator helps you to compute the inverse normal probability distribution and confidence interval for the given values. It also displays a graph for confidence level, left, right and two tails on the basis of probability, mean, standard deviation.

## What is Inverse Normal Distribution?

In statistics, the inverse normal distribution is an inverse working method of finding the value of x from a known probability. This is an informal term and does not involve any specific probability distribution.

### Inverse Normal Formula

The Invnorm formula uses the following parameters:

• Probability (required parameter): Probability corresponding to a normal distribution.
• Mean (required parameter): Arithmetic mean of the distribution.
• Standard deviation (required parameter): Standard deviation of distribution.

$$f(x, μ, σ) = 1 / ( \sqrt{2 π} σ ) e^{-(x – μ)}^2 / 2 σ^2$$

Where,
μ = mean
σ = variance
x = independent variable

## How does Invnorm Calculator Works?

An online inverse normal distribution calculator helps you to find inverse probability distribution by following steps:

### Input:

• First, substitute the values for Probability, Mean, and Standard Deviation.
• Hit the calculate button.

### Output:

• The inverse norm calculator displays the values for left, right, two tails and standard deviation with graph.

## Reference

From the source of Wikipedia: Relation to original distribution, Reciprocal distribution, Inverse uniform distribution, Inverse t distribution, Reciprocal normal distribution.