JEE Math Practice Question
If the standard deviation of the numbers –1, 0, 1, k is $$\sqrt 5$$ where k > 0, then k is equal to
- A.2$$\sqrt 6 $$
- B.$$\sqrt 6 $$
- C.$$2\sqrt {{{5} \over 6}} $$
- D.$$2\sqrt {{{10} \over 3}} $$
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