in examination 25 students secured marks

23 28 30 32 35 36 40 41 43 44 45 45 48

49 52 53 54 56 56 58 61 62 65 68 arrange these data in form of frequency distribution usingclass as intervals

20-29 30-39 40-49 50-59 60-69 aarange the data in cumulative frequency