Fifty patients in a city hospital were surveyed and the following data show their ages. Construct a complete frequency distribution of the ages consisting of 9 classes.

54 62 71 8 18 35 61 45 38 80

47 58 65 19 53 28 19 33 41 29

30 32 44 55 56 75 82 39 34 66

17 43 31 47 64 7 76 60 10 27

26 83 92 35 58 62 78 43 31 19