16 36 16 30 21 37 30 31 37 25 34 26 37 22 27 27 32 35 25 40 19 41 28 25 29 25 30 26 33 17 19 36 30 24 26 28 15 17 38 23 24 23 Class Tally Frequency Class Ix Mean Class Relative Cumulative f(x-1) Limits Mark/ (x) Boundaries Frequency Frequency Midpoint (x)