A group of 20 students travelled to a gymnastics tournament together. Their ages, in years, are given in the following table. Age (years) 14 15 16 17 18 19 20 22 Frequency 1 2 7 1 4 1 1 3 (a.ii) For the students in this group write down the median age. 14+15+16+17+18+19+20 +22=141 8 = 17.625 = 146 The lower quartile of the ages is 16 and the upper quartile is 18.5. (b) Draw a pox-and-whisker diagram, for these students' ages, on the following grid. 13 14 15 16 17 18 19 -20 20 21 Age (years) 22 -22 23 24