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  • The mean of the following frequency distribution is 18. The frequency f in the class interval 19 – 21 is missing. Determine f. Class Interval<

The mean of the following frequency distribution is 18. The frequency f in the class interval 19 – 21 is missing. Determine f.

Class Interval 11-13 13-15 15-17 17-19 19-21 21-23 23-25
Frequency  3 6 9 13 f 5 4

 

 

 

 

 
 
 
 
 

Answers (1)

C.I. f x xf
11-13 1 12 36
13-15 6 14 84
15-17 9 16 144
17-19 13 18 234
19-21 f 20 20f
21-23 5 22 110
23-25 4 24 96
Total 40+f   704+20f

\text { Mean }=\frac{\sum x f}{\sum f} \\ 18=\frac{704+20 f}{40+f} \\ 720 + 18f = 704 + 20 f \\\ 2f = 16 \\ f = 8

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Safeer PP

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