**The Inverse Normal Probability Distribution Function** **invNorm() is used to find the z score on TI-NSpire.**

**invNorm(area**, **μ**, **σ****)**

where:

**area:**the given area to the left.**μ:**population mean**σ:**population standard deviation

**Note**: Finding the Z-score indicates that the given distribution is a standard normal distribution with a mean of 0 and a standard deviation of 1.

In this blog post, we will discuss with step by step guide on how to find the z score on TI-NSpire and examples.

## How to use invNorm to find z score on TI NSpire

The following steps will guide us on using the **invnorm** function, and how to calculate the Z-Score on TI-NSpire Calculator:

**Step 1:** Press the **“menu”** button and select **Statistics** i.e. 6th option.

**Step 2:** Select **“Distribution”** i.e 5th option.

**Step 3:** Now, select “**Inverse Normal function**” (invNorm) i.e 3rd option, and it brings up the inverse Normal wizard screen.

**Step 4:** Enter the given area in the area column followed by 0 for mean and 1 for standard deviation. For example, to find the z-score associated with the 0.145 area, type 0.145,0,1.

The TI-nspire will calculate the z-score associated with the given area.

Let’s discuss a few examples to find the z score for the given area on TI NSpire

## Find Z-Score corresponding to the area 0.8665 Using TI-nspire

Let’s draw the normal distribution curve for area = 0.8665

The following steps will guide how to calculate the z score for the area 0.8665 on TI-nspire Calculator:

**Step 1:** Press the **“menu”** button and select **Statistics** i.e. 6th option.

**Step 2:** Select **“Distribution”** i.e 5th option.

**Step 3:** Now, select “**Inverse Normal function**” i.e 3rd option, and it brings up the inverse Normal wizard screen.

**Step 4:** Enter the given area 0.8665 in the area column followed by 0 for mean and 1 for standard deviation.

The resultant z-score for the given area is **1.1**.

**Conclusion: **The Z-score associated with the 0.8665 area in the normal standard distribution is **1.1**.

**Cool Tip:** Read more on how to calculate the z score on TI-84 plus!

## Find Z Score for the area to the right is 0.3783 on TI-nspire

Let’s draw the normal distribution curve for the area to the right = 0.3783

The following steps will guide how to calculate the z score corresponding to the area to the right is 0.3783 on TI-nspire Calculator:

**Step 1:** Find the area to the left in order to calculate the z score.

area to the left = 1- area to the right

area to the left = 1 – 0.3783

area to the left = 0.6217.

**Step 2:** Press the **“menu”** button and select **Statistics** i.e. 6th option.

**Step 3:** Select **“Distribution”** i.e 5th option.

**Step 4:** Now, select “**Inverse Normal function**” i.e 3rd option, and it brings up the inverse Normal wizard screen.

**Step 5:** Enter the given area 0.6217 in the area column followed by 0 for mean and 1 for standard deviation.

The resultant z-score for the given area is **0.31**.

**Conclusion: **The Z-score associated with the 0.3783 area to the right in the normal standard distribution is **0.31.**

**Cool Tip:** Read more on how to Calculate Z Score in Excel!

## Conclusion

I hope the article on how to find the **z score on the TI-nspire calculator** is useful to you.

**invNorm** (Inverse normal distribution) function is used to calculate the z score from the given area on the TI-nspire calculator.

**Cool Tip:** Read more on how to use the z table chart and how to find the z score for the top 5th percentile of standard normal distribution.

You can find more topics about Z-Score and how to calculate z score given the area, read the z score table on the ZScoreGeek home page.