Q 14. The arithmetic mean of the following frequency distribution is 18, then the value of f is
C.I. 11 – 13 13 – 15 15 – 17 17 – 19 19 – 21 21 – 23 23 – 25
FREQUENCY 7 6 9 13 f 5 4
a) 20 b) 15 c) 25 d) 10
Answers
Answer:
I don't know the answer it can be on google
Step-by-step explanation:
Given the mean of the data is 18
(CI) Midvalue X d=X-A F f{d}'
11-13 12 -6 3 -3 -9
13-15 14 -4 6 -2 -12
15-17 16 -2 9 -1 -9
17-19 18 (=A) 0 13 0 0
19-21 20 2 F 1 F
21-23 22 4 5 2 10
23-25 24 6 4 3 12
........................................................................................................................
We know step Deviation method,
Mean
Where A= Assumed Mean,
h= Class size . here h= upperlimit - lowe limit=2
MeanMissing frequency F is 8
HOPE IT HELPS..!