Question

mean is 18. C.I 11-13,13-15,15-17,17-19,19-21,21-23,23-25 and F.I is 7,6,9,13,f,5,4 find the value of 'f​' by step - deviation method ​

Answer 1

Answer:

Lets take assumed mean, A as 16

Class interval =2

∴u

i

=

h

x

i

−A

=

2

x

i

−16

Now, we have A=16,

x

ˉ

=18 and h=2

We know that,

Mean,

x

ˉ

=A+h(

N

1

∑f

i

u

i

)

⇒18=16+2(

f+44

2f+24

)

⇒

f+44

2f+24

=1

⇒f+44=2f+24

⇒f=20

Hence, the value of missing frequency, f=20

Step-by-step explanation:

MARK ME AS BRAINLIEST IF IT IS CORRECT.. purple u sorry i tried yo copy paste but this happened...*inner screaming*༼;´༎ຶ ۝ ༎ຶ༽