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Question

Calculate mode for the following data shows the number of colour pencils the students have in a class.
Colour Pencils055101015152020252530
Number of students14161713812

A
11
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B
15
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C
19
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D
16
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Solution

The correct option is B 11
The lower limit ( l ) of the modal class =10,
The class size ( h) =5,
The frequency (f1) of modal class =17,
The frequency (f0) of the class preceding the modal class =16,
The frequency (f2) of the class succeeding the modal class =13.
Now, using the formula Mode=l+(f1f02f1f0f2)×h
=60+(1716(2×17)1613)×5
=10+0.2×5
=10+1
=11
Therefore, mode of colour pencil students have is 11

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