The table below shows how much time some people spent exercising yesterday. a) What is the modal class of time spent exercising? b) In which class does the median lie? Time spent, x (minutes) 0≤x≤10 10< x≤20 20< x≤30 30< x≤40 40< x≤50 50≤x≤60 Frequency 18 14 3 16 21 7​