The range of the data is from 21 to 100. For 10 intervals, the data can be grouped in 10 classes of width 8 each, as shown below. The total data is 47. This has been put in appropriate intervals shown there in

Interval frequency relative frequency

21-28 1 1/47 =0.02

29-36 1 1/47 =0.02

37-44 1 1/47 =0.02

45-52 0 0 =0

53-60 2 2/47 =0.04

61-68 2 2/47 =0 .04

69-76 9 9/47 =0 .19

77-84 11 11/47= 0.23

85-92 8 8/47 = 0.17

93-100 12 12/47 =0.26

Total 47 1

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