**The normal distribution is a continuous probability distribution. The total area under the standard normal curve is always 1. The normal distribution looks like a bell-shaped curve.**

In this article, we will discuss a step-by-step guide on finding the area under the standard normal curve to the left of the z score.

## The area under the Standard Normal Curve to the left of z

**Steps to find the area under the standard normal curve to the left of z **

**Step 1:** Choose between a negative z-table or a positive z-table corresponding to the given z-score.

**Step 2:** Check the area value for the given z in the z-table.

**Step 3:** Look at the first two digits of the z-score on the left side column (y-axis) of the z-table and then the remaining number on the x-axis on the topmost row.

**Step 4:**The intersection of the two will be the required area.

**Step 5:** Multiply it by 100 to calculate the percentage of area.

Let’s understand find the area under the standard normal curve to the left of z using an example.

**Z-Score Tip:** Read more on how to calculate the z-score!

**How do you find the area to the left of z = 1.55**?

**To find the area to the left of the given z follows the below steps:**

**Step 1:** Choose a positive z-table as the given z-score (i.e 1.55) is positive.

**Step 2:** Check the area value for the given z in the z-table.

**Step 3:** Look at the first two digits (1.5) of the z-score on the left side column (y-axis) of the z-table and then the remaining number (0.05) on the x-axis on the topmost row.

**Step 4:**The intersection of the two is 0.9394 (highlighted in red).

**Step 5:** Multiply it by 100 to calculate the percentage of area.

area to the left = 0.9394*100 = 93.94%

**Result:** The area to the left of z is 93.94% of the normal standard curve.

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

## Conclusion

I hope the above article to find the area under the standard normal curve to the left of z using step by step guide is helpful to you.

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