Three sets of data on comparable situations areavailable as under : Set No. No. of data Mean Value Standard Deviation 1. 9 8 1.6 2. 12 7 1.2 3. 15 9 1.4 Considering all the data sets together, the coverall mean value would be

EPFO 2012 Solved Paper

Question : 4 of 100

Marks: +1, -0

Three sets of data on comparable situations areavailable as under :

Set No.	No. of data	Mean Value	Standard Deviation
1.	9	8	1.6
2.	12	7	1.2
3.	15	9	1.4

Considering all the data sets together, the coverall mean value would be

Solution:

Required overall mean value

={9 × 8 + 12 × 7 + 15×9}/{9+12+15 }

={72+84+135}/36

={291}/36=8 .08

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