## 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.

How do you find the first quartile Q1?

The first quartile Q1 is the median of the lower half not including the value of Q2. The third quartile Q3 is the median of the upper half not including the value of Q2.

What is the first quartile of?

First quartile: the lowest 25% of numbers. Second quartile: between 25.1% and 50% (up to the median) Third quartile: 50.1% to 75% (above the median)

### How do I find the lower quartile?

To find the lower quartile or the value that is one quarter of the way along the list, count how many numbers there are, add 1 and divide by 4.

What is the first quartile?

The lower quartile, or first quartile, is denoted as Q1 and is the middle number that falls between the smallest value of the dataset and the median. First quartile: the lowest 25% of numbers. Second quartile: between 25.1% and 50% (up to the median) Third quartile: 50.1% to 75% (above the median)

How do you find Q1 Q2 Q3 on calculator?

Quartile Formula:

1. Formula for Lower quartile (Q1) = N + 1 multiplied by (1) divided by (4)
2. Formula for Middle quartile (Q2) = N + 1 multiplied by (2) divided by (4)
3. Formula for Upper quartile (Q3) = N + 1 multiplied by (3) divided by (4)
4. Formula for Interquartile range = Q3 (upper quartile) – Q1 (lower quartile)

#### What is the lower quartile equal to?

The first quartile (or lower quartile), Q1, is defined as the value that has an f-value equal to 0.25. This is the same thing as the twenty-fifth percentile. The third quartile (or upper quartile), Q3, has an f-value equal to 0.75. The interquartile range, IQR, is defined as Q3-Q1.

What is the formula for first quartile?

Type “=” and the quartile formula, including the range cells of that contain the data and “1” for the quartile number, to determine the first quartile of the set of data. Press “Enter” after typing. For example, type “=QUARTILE (A1:A8,1)” and press “Enter.”. This equals 3.75, which is the first quartile of the set of data in cells A1 through A8.

What is the difference between the first and third quartile?

A quartile is a type of quantile. The first quartile ( Q1) is defined as the middle number between the smallest number and the median of the data set. The second quartile ( Q2) is the median of the data. The third quartile ( Q3) is the middle value between the median and the highest value of the data set.

## How do you find the lower and upper quartile?

Order your data set from lowest to highest values

• Find the median. This is the second quartile Q 2.
• At Q 2 split the ordered data set into two halves.
• The lower quartile Q 1 is the median of the lower half of the data.
• The upper quartile Q 3 is the median of the upper half of the data.
• Are quartiles divided into four equal quarters?

In statistics, a quartile is a type of quantile which divides the number of data points into four parts, or quarters, of more-or-less equal size. The data must be ordered from smallest to largest to compute quartiles; as such, quartiles are a form of order statistic.