JEE Math Practice Question
A student scores the following marks in five tests : 45, 54, 41, 57, 43. His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
- A.$$100 \over {\sqrt 3}$$
- B.$$10 \over {\sqrt 3}$$
- C.$$10 \over3$$
- D.$$100 \over3$$
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