Question

Calculate mean from following data
Marks 5-15 15-25 25-35 35-45 45-55 55-65
N. Of students 8 12 6 14 7 3

Answer 1

Explanation:

here I have calculated meanby first coverting classes into thier mid values and then multiplied the maid values with given frequency .

Then using formula of direct method I calculated the mean.