1. Median & Quartiles Example Find the median for the set of numbers
3, 1, 4, 7, 8, 1, 9
8, 7, 3, 4, 4, 8, 6, 2, 1, 5

2. Example
Sally’s last 8 maths tests are as listed below. Find her median score. 34 26 17 54 51 45 39 48

3. Example
Find the median for each of the following set of numbers
6, 15, 12, 11, 8, 16, 21, 9, 13
8, 13, 7, 1, 23, 14, 17, 18
45, 28, 44, 34, 65, 31, 48, 78, 70, 29, 40
1.3, 1.7, 1.9, 2.0, 1.1, 0.9, 2.1, 1.6

4. Example
Michael’s last 10 maths tests are as listed below. Find his median score. 14 56 78 45 42 68 18 27 41 55

5. Calculating the quartiles
Example Find the quartiles for the set of numbers
3, 1, 4, 7, 8, 1, 9
8, 7, 3, 4, 4, 8, 6, 2, 1, 5

6. Example
The speeds in miles per hour of 32 cars on a motorway were recorded.
The speeds were 68 69 74 81 61 70 65 91 58 71 82 83 55 97 67 75 78 62 51 92 41 54
work out the median for this data
What are the lower and upper quartiles for this data.

7. Example
The number of passengers in a 72-seater aeroplane was noted on each of its 20 flights in one day.
48, 54, 72, 21, 37, 45, 72, 41, 59, 63, 54, 59, 68, 72, 70, 64, 41, 32, 24, 31
Work out the three quartiles for this data.