Question

03
The following distribution shows the daily pocket allowance of children of a locality.
The mean pocket allowance is * 18. Find the missing frequency f.
11-1313 - 1515-17 17.1919-21 21-23/23 - 25
Daily pocket
allowance (in)
7
Number of children
9
6
13
4
5
f​

Answer 1

​  

18⇒(given)

∴  

44+x

752+20x

​  

=18

⇒752+20x=18(44+x)

⇒752+20x=792+18x

⇒2x=40

⇒x=20

Hence, the missing frequency is 20.