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The class size and class mark respectively of the class 15-20 is:

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17.5,15

5,15

5, 17.5

5,20

answer is C.

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Detailed Solution

The given class is 15-20.
Here, upper limit = 20, lower limit = 15.
Now,
Class size =

upper limit – lower limit

\Rightarrow Class size = 20 - 15

\Rightarrow Class size = 5

Also,
Class mark =

\frac{upper limit + lower limit}{2}

\Rightarrow

Class mark =

\frac{20 + 15}{2}

\Rightarrow

Class mark =

\frac{35}{2}

\Rightarrow

Class mark = 17.5
The class size and class mark respectively of class 15-20 is 5, 17.5.
Hence, the correct option is 3.

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