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Q.

What will be the class mark of the class 65-75?


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a

100

b

110

c

70

d

120 

answer is C.

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Detailed Solution

We have to find the class mark of the class 65-75.
Using the formula for the class mark of a class:
(upper limit + lower limit) 2
The upper limit of the class is 75 and the lower limit of the class is 65.
Substituting 75 for the upper limit and 65 for the lower limit in the above formula:
75+65 2 = 140 2 =70 So, the class mark of the given class is 70.
Therefore, option 3 is correct.
 
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What will be the class mark of the class 65-75?