# Q 11 - Mathematics

Sum

Q 11

#### Solution

we have,

 C.I f class mark       x fx 0 - 10 8 5 40 10 - 20 5 15 75 20 - 30 12 25 300 30 - 40 35 35 1225 40 - 50 45 45 1080 50 - 60 55 55 880 ∑ f = 100 ∑ fx =  3600

Now , Mean = (∑fx)/(∑f) = 3600/100 = 36

Is there an error in this question or solution?