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Class Interval=Range/No of Classes

Hence, No of Classes=Range/Class Interval

Range= Higher No-Lowest No=135-39=96

No of Class=96/14=6.85 Classes

Hope this will help. Let me know for any further clarification.

The following data are weights of people on a diet plan;

{52, 75, 92, 101, 83, 68, 133, 78, 104, 61, 39, 46, 135, 87, 131, 99, 104, 86, 67, 116, 89, 57, 87, 98, 131, 116, 135, 93}

a)      With a class interval of 14, determine how many classes you get (4 marks)

b)      Presents these weights by use of a frequency distribution table (6 marks)

c)      From b) calculate the average weight (5 marks

Help me to know how to calculate class interval in statistics for example the class interval is given as 14. How would you solve that?