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Q.

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


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a

17.5,15

b

5,15

c

5, 17.5

d

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
⇒Class size=20-15
⇒Class size=5
Also,
Class mark = upper limit+ lower limit2
⇒ Class mark = 20+ 152
⇒ Class mark = 352
⇒ 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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The class size and class mark respectively of the class 15-20 is: