## How do you find the 25th quartile?

If there are (4n+1) data points, then the lower quartile is 25% of the nth data value plus 75% of the (n+1)th data value; the upper quartile is 75% of the (3n+1)th data point plus 25% of the (3n+2)th data point..

## How do I 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.

## What is quartiles give the formula to find out q3?

Question: Find the upper quartile for the following set of numbers: 27, 19, 5, 7, 6, 9, 15, 12, 18, 2, 1. Solution: The upper quartile formula is: Q3 = ¾(n + 1)th Term. … Q3 = ¾(n + 1)th Term.

## How do you find the q1 25th percentile?

The Quartiles also divide the data into divisions of 25%, so: Quartile 1 (Q1) can be called the 25th percentile….And the result is:Quartile 1 (Q1) = 3.Quartile 2 (Q2) = 5.5.Quartile 3 (Q3) = 7.

## Is the First Quartile the same as the 25th percentile?

Quartiles are special percentiles. The first quartile, Q1 , is the same as the 25 th percentile, and the third quartile, Q3 , is the same as the 75 th percentile. The median, M , is called both the second quartile and the 50 th percentile.