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Question

Convert the following data into grouped frequency distribution:
3,4,5,6,6,5,4,3,2,2,2,1,7,7,8,2

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Solution

First arrange the data in ascending order
1,2,2,2,2,3,3,4,4,5,5,6,6,7,7,8
The largest number =8
The smallest number =1
Range = largest number smallest number =81=7
We shall calculate an approximate group size, by dividing the range by the number of groups we want.
If we want 3 groups, then Divide range with number of groups =73=2.333
The class width will be 2, Starting from 1.
Class interval Frequency
13 7
46 6
79 3

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