Question

Find the missing frequency (f) , if the mean of the following data is 18 CI f 11-13 7 13-15 6 15-17 9 17-19 13 19-21 f 21-23 5 23-25 4​

Answer 1

Answer:

$\huge \mathbb \pink {Answer}$

Step-by-step explanation:

Class Interval  Mid Value

       xi Frequency 

        fi fixi 11 - 13 12 3 36 13 - 15 14 6 84 15 - 17 16 9 144 17 - 19 18 13 234 19 - 21 20f 20 f 21 - 23 22 5 110 23 - 25 24 4 6   ∑f=40+f ∑fx=704+20fGiven : Mean =18

We know, Mean (x)=ΣfΣfx

⟹18=40+f704+20f

⟹18(40+f)=704+20f

⟹720+18f=704+20f

⟹720−704=20f−18f

⟹2f=16

⟹f=8

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Answer 2

$\huge \orange{ \overbrace{ \red{\underbrace \color{blue} {\underbrace \color{black}{\colorbox{lime}{ {\red \: {☘ Arnav Bangaram ☘ }}}}}}}}$