# How to Find the Upper Quartile

Save

Quartiles break down data into four groups based on the results. The upper quartile equals the highest 25 percent of scores. For example, on a standardized test, the upper quartile would be the 25 percent of test takers who earned the highest scores on the test. If you need to place in the top 25 percent, such as if you want to attend a college that only accepts students in the top 25 percent, you need to know how to find the top quartile.

### Things You'll Need

• Calculator
• Add 1 to the number of items in your data set. For example, if your data set has 23 items, add 1 to 23 to get 24.

• Multiply the result by 3/4 to find the item in your data set that equals the upper quartile. In this example multiply 24 by 3/4 to get 18.

• Identify the item or items the number corresponds to on a list of your data points organized from smallest to largest. If the number in Step 2 is a decimal, find the value of the point above and below. For example, if the Step 2 result equals 15.5, find the 15th and 16th number. In the current example, find the 18th number to find the upper quartile.

• Take the average of the two surrounding items if you get a decimal for Step 2. For example, if you get 15.5, take the average of the 15th and 16th smallest numbers to find the upper quartile.

## References

• Photo Credit Jupiterimages/BananaStock/Getty Images
Promoted By Zergnet

### You May Also Like

• How to Find High School Classmates

Several years after high school graduation you start to wonder what happened to some of your classmates. Maybe you want to find...

• How to Calculate a Lower Quartile

When statistically analyzing lists of numbers, it is often necessary to identify key values. These values include the minimum, maximum, median and...

• How to Calculate Quartiles

When ranking numbers, such as test scores or the length of elephant tusks, it can be helpful to conceptualize one rank in...

## Related Searches

Check It Out

### Can You Take Advantage Of Student Loan Forgiveness?

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!