Question

if the mean of the following data is 50 find the missing frequency f classes 0-20 20-40 40-60 60-80 80-100 frequency 6 8 6 f 5

Answer 1

Answer:

class x f fx

0 - 20 10 12 120

20 - 40 30 x 30x

40 - 60 50 6 300

60 - 80 70 7 490

80 - 100 90 9 210

Sum 34+x 1720+30x

x

ˉ

=

∑f

∑fx

34+x

1720+30x

=44

1720+30x=44(34+x)

1720+30x=1496+44x

224=14x

x=16

Answer 2

Hope it helps you.......