The mean of the following distribution is 18. Class interval Frequency 11 - 13 3 13 - 15 6 15 - 17 9 17- 19 13 19 - 21 f 21 - 23 5 23 - 25 4 What is the value of f ? [2014 CDS-I]

UPSC CDS Math Statistics Questions

Question : 63 of 63

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The mean of the following distribution is 18.

What is the value of f ?

[2014 CDS-I]

Class Interval	Mid-value (x)	Frequency (f)	fx
11-13	12	3	36
13-15	14	6	84
15-17	16	9	144
17-19	18	13	234
19-21	20	f	20f
21-23	22	5	110
23-25	24	4	96
		Σf=40+f	Σfx=704+20f

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