10 5 GCSE performance at schools in England can be compared using Progress 8. A higher score in Progress 8 means a better performance. South West London schools are believed to have ‘well above average’ scores in Progress 8. Provisional scores for summer 2018 for a random sample of 10 state schools in South West London are given in Figure 3, together with the average for all English state schools. State Schools in South West London Progress 8 scores Summer 2018 A 1.19 B 1.09 C 0.98 D 0.73 E 0.63 F 0.28 G 0.24 H 0.23 I −0.07 J −0.09 Average for all English state schools −0.02 (Source: © Crown Copyright) Figure 3 Davinder has tested a hypothesis. The first two lines of his working are given in Figure 4. X ~ B (10, 0.5) P (X ≤ 2) = 0.0547 Figure 4