Question

find the mean of the following days by direct method CI 1-5 5-9 9-13 13-17 17-21 Frequency 4 3 5 7 1​

Answer 1

Answer:

∑f

i

=40 ∑f

i

x

i

=1980

⇒

x

=

∑f

i

∑f

i

x

i

=

40

1980

=49.5