Quantitative Aptitude Interview Question:

Which of the following set of numbers has the highest Standard deviation?
a) 1,0,1,0,1,0
b) -1, -1, -1, -1, -1, -1
c) 1,1,1,1,1,1
d) 1,1,0, -1,0, -1

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There is a mathematical formula for calculating standard deviation, but you don't need it for this question. StDev is a measurement of how much variation there is among different numbers in a series. Since choices b and c contain the same number 6 times, there is no variation. choice d also doesn't show much variation. Number 1 does vary from one point to the next, so it has variance, and therefore would have a higher StDev.

ans: choice (a)
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