Question

Class intervals in a grouped frequency distribution are given as 4-11,12-19,20-27,28-35,36-43.Write the next two class intervals. (1)What is the length of each class interval?(2)Write the class boundaries of all classes, (3)What are the class marks of each class?

Answer 1

the next two class intervals are 44-50,51-57
[1]length of the class interval is upper boundary-lower boundary
                                            11-4=7
                                             19-16=7
                                            27-20=7.........
therefore length=  7
    [2] 
      CI                         CB
    4-11                      3.5-11.5
    12-19                   11.5-19.5
    20-27                   19.5-27.5
    28-35                   27.5-35.5
    36-43                   35.5-43.5
    44-50                   43.5-50.5
    51-57                   50.5-57.5                       
                                                         

Answer 2

Step-by-step explanation:

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