## How do you find quartiles GCSE maths?

Interquartile range – Higher To find the median value, or the value that is half way along the list, the method is to count the number of numbers, add one and divide by 2. 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.

**How do you find the higher 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 the quartiles Q1 Q2 Q3?

Quartile Formula:

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

**Which is the upper quartile of the range?**

The upper quartile (UQ) is the value three quarters of the way along the data. To find its position we calculate 3 (n+1) ÷ 4, where n is the number of data values. The inter-quartile range is then the difference between these.

## How to find the lower quartile in Excel?

The numbers are already in order so the minimum and maximum numbers can be easily read off as 9 and 21, and the middle number can be read as 14. To find the lower quartile, there are 11 numbers, so \\ (\\frac {11 + 1} {4}\\) = 3rd number. The lower quartile will be the 3rd number and the upper quartile is the 9th number.

**How to do cumulative frequency and box plots in GCSE?**

Edexcel GCSE Mathematics (Linear) – 1MA0 CUMULATIVE FREQUENCY & BOX PLOTS Materials required for examination Items included with question papers Ruler graduated in centimetres and Nil millimetres, protractor, compasses, pen, HB pencil, eraser. Tracing paper may be used. Instructions Use black ink or ball-point pen.

### What kind of GCSE is the Edexcel 9 to 1?

The Pearson Edexcel Level 1/Level 2 GCSE (9 to 1) in Mathematics is designed for use in schools and colleges. It is part of a suite of GCSE qualifications offered by Pearson. Purpose of the specification This specification sets out: the objectives of the qualification