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

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

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

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

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

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.

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.