Question

how to find arthmatic mean for grouped data
(Formulas)
urgent please.......

Answer 1

sum of all the values / no of values

Answer 2

Sn = n/2 [ 2a + ( n-1) d ]

Sn = n/2 ( 2a + l )

Where n is the no. Of terms

a is the first term

d is the common difference and

l is the last term