## 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.

## How do you calculate first quartile?

Quartiles are the values that divide a list of numbers into quarters: Put the list of numbers in order. Then cut the list into four equal parts. The Quartiles are at the “cuts”

And the result is:

- Quartile 1 (Q1) = 4.
- Quartile 2 (Q2), which is also the Median, = 5.
- Quartile 3 (Q3) = 7.

## How do you find the upper quartile?

The upper quartile is the median of the upper half of a data set. This is located by dividing the data set with the median and then dividing the upper half that remains with the median again, this median of the upper half being the upper quartile.

## How do you find q1 and q3 in grouped data?

Finding Q1,Q3, and IQR ( Interquartile Range) –