The class mark of class 90-120 is: (a) 90 (b) 105 (c) 115 (d) 120

We know that,

Class mark = (upper limit + lower limit) / 2

Then,

Class mark = (120 + 90) / 2

We get,

Class mark = 210 / 2

Class mark = 105

Therefore, option (b) is the correct answer

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