Question
Two data set of size 9 and 6 have standard deviation 3
and 4 respectively and arithmetic means 3 and 3 respectively. The standard deviation of combined data set of size 15 isSolution
The correct answer is A
More Welfare Economics Questions
- What will come in place of the question mark (?) in the following series?
712, ?, 576, 508, 440, 372 1, 26, 75, 156, 277, ?
12, 19, 32, ?, 76, 107
8, 27, 53, ?, 161, 285
What will come in place of the question mark (?) in the following series?
4, 11, 32, 95, 284, 851, ?
78, 80, 84, ?, 108, 140
51, 60, 78, ?, 141, 186
94Â Â Â 115Â Â Â 138Â Â Â 163Â Â Â Â 190Â Â Â Â ?
Find the missing number, in the given number series.
25, 30, 40, 57, ?, 120
324Â Â Â Â Â Â Â Â 972Â Â Â Â Â Â Â Â 486Â Â Â Â Â Â Â Â 1458Â Â Â Â Â Â 729Â Â Â Â Â Â Â Â ?
...
