Question

how to find class mark

Answer 1

smallest class size/class size of given class × its frequency

Answer 2

To find class marks we have to subtract lower limit from Upper limit and divide it by two.
Lower Limit is the no. which is at first than the no. which is at his side, e.g. 20-30 here 20 is the lower limit and 20 is the upper limit.
Formula =UP-LP/2
Up is upper limit and Lp is lower limit.
E.G. 35-55
Ans =55-35/2=20/2=10
I hope it helps.
Please mark my ans as brainlist answer