Question

Find the mean of 25-35,35-45,45-55,55-65,65-75 frequency 6,10,8,12,4

Answer 1

(S)sum of all the numbers

25-35 + 35-45 + 45-55 + 55-65 + 65-75

= 25 - 75

= - 50

(n)No. of numbers = 5

Mean of the numbers = S/n

= - 50/5

= - 10 ANS.