. The class mark of the class 90-120 is
To find the class mark of a class interval, we find the sum of the upper limit and lower limit of a class and divide it by 2 Thus,
Class -mark=Upper limit + Lower limit/2
Here, the lower limit of 90-120=90
And the upper limit of 90-120=120
Hence, the class mark of the class 90-120 is 105
That is, option (B) is correct.
Option (B) 105 is correct.