Question

this question with direct and shortcut method​

Answer 1

Answer:

frequency(f)= 76

class mark= lower limit+upper limit of intervals÷ 2

f (x) = frequency× class mark(of each intervals)

f (x) = 3820

direct mean method

mean= sigma f(x) / sigma (f)

= 3820/76

= 50.26

hope this helps you:)