Ages of 56 attendees of a Harry Potter movie are shown ...

      15.9 Ages of 56 attendees of a Harry Potter   movie are shown.    (a)   Form seven age classes (10 to 20, 20 to 30, etc.). Tabulate the frequency of attendees in each   class.    (b)   Calculate expected frequencies      for   each class.         (c)   Perform a chi-square GOF test for a uniform distribution, using the 5 percent   level   of significance.                 Harry         10 22 58 11 73 22 57   35 33 33 59 54 55 75   79 24 13 73 52 69 30   71 64 17 50 72 67 50   72 35 26 59 47 65 35   64 34 39 66 37 41 58   51 43 29 74 73 50 62   58 34 50 27 13 67 67