Teacher's Guide - Pearson

Exercise 20.3 (Student’s Book page 375)1. Weights of 100 students120Cumulative frequency100806040202.029 39 49 59 69 70 80Weight (kg)a) i) 46 kgii) 40 kgiii) 54 kgiv) 54 2 40 5 14b) i) 23 rd percentile 5 39 kgii) 60 th percentile 5 48 kgiii) 89 th percentile 5 64 kgc) About 87%300Distance travelled by students to schoolCumulative frequency2502001501005005 10 15 20 25 30 35Distance (km)a) i) 15 kmii) 11.5 kmiii) 20 kmiv) 20 2 11.5 5 8.5 kmb) i) 10 kmii) 22 kmChapter 20: Measures of central tendency and dispersion129