# How do you find the fourth quartile?

Category:
personal finance
home financing

The first

**quartile**has 25% of the data below it, 2nd**quartile**= median has 50% of data below it, third**quartile**has 75% data below and 25% above. IQR = 3rd**quartile**- 1st**quartile**. A**fourth quartile**would be the maximum, which you can't get from the median and IQR.

People also ask, is there a 4th quartile?

Second **quartile**: between 25.1% and 50% (up to the median) Third **quartile**: 51% to 75% (above the median) **Fourth quartile**: the highest 25% of numbers.

**The formula for quartiles is given by:**

- Lower Quartile (Q1) = (N+1) * 1 / 4.
- Middle Quartile (Q2) = (N+1) * 2 / 4.
- Upper Quartile (Q3 )= (N+1) * 3 / 4.
- Interquartile Range = Q3 – Q1.

Moreover, how do you find 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**.

**Deciles** are similar to quartiles. But while quartiles sort data into four quarters, **deciles** sort data into ten equal parts: The 10th, 20th, 30th, 40th, 50th, 60th, 70th, 80th, 90th and 100th percentiles. A person who scored very low (say, the **5th** percentile) **would** find themselves in a **decile** rank of 1.