The class marks of a distribution are 6,10,14,18,22,26,30. Find the class size and class interval.

Asked by Sthitaprajna Mishra | 22nd Feb, 2014, 03:32: PM

Expert Answer:

We observe that 10 - 6 = 4, 14 - 10 = 4 .....& so one.
 
Hence, class size is 4.
 
Now, the difference between the values of two consecutive class marks is 4, therefore we subract 4/2 = 2 from each class mark to get the lower limit of the corresponding class interval and add 5 to each class mark to get the upper limit.
 
Thus, the class intervals are
4 - 8
8 - 12
12 - 16
16 - 20
20 - 24
24 - 28
28 - 32
 

Answered by  | 22nd Feb, 2014, 09:44: PM

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