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The marks of a student in 6 tests are 41...

The marks of a student in 6 tests are `41, 45, 54, 57, 43` and x. If the mean marks of these tests is 48. then standard deviation of these tests is

A

`(10)/sqrt3`

B

`(100)sqrt3`

C

`(10)3`

D

`(100)/sqrt3`

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The correct Answer is:
A
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