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Question
The width of each of nine classes in a frequency distribution is 2.5 and the lower class boundary of the lowest class 10.6. Then the upper class boundary of the highest class is
Options
35.6
33.1
30.6
28.1
Solution
The number of classes is 9 and the uniform class size is 2.5. The lower limit of the lower class (first class) is 10.6. Therefore, the upper limit of the last class is
`10.6 + (9xx2.5)`
=10.6 + 22.5
=33.1
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