## How do you find the q1 and q3?

Q1 is the median (the middle) of the lower half of the data, and Q3 is the median (the middle) of the upper half of the data. (3, 5, 7, 8, 9), | (11, 15, 16, 20, 21). Q1 = 7 and Q3 = 16. Step 5: Subtract Q1 from Q3.

## How do I find the third quartile?

Quartiles are numbers used to divide a set of data into four equal parts, or quarters. The upper quartile, or third quartile, is the top 25% of numbers in the data set, or the 75th percentile. The upper quartile is calculated by determining the median number in the upper half of a data set.

## How do I find the first quartile?

**Answers**

- The values in ascending order are: Median = (12th + first) ÷ 2.
- Range = difference between the highest and lowest values. = 57 – 1.
- Lower quartile = value of middle of first half of data Q1 = the median of 1, 11, 15, 19, 20, 24.
- Upper quartile = value of middle of second half of data Q3
- Interquartile range = Q3–Q1

## How do you find the first and third quartile with an even amount of numbers?

How to Find Quartiles on Even Ranges : Trigonometry, Statistics