A student scores the following marks in five tests: \( \mathrm{P} \...

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A student scores the following marks in five tests:
\( \mathrm{P} \) \( 45,54,41,57,43 \). His score is not known for the

W sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
(1) \( \frac{10}{\sqrt{3}} \)
(2) \( \frac{100}{\sqrt{3}} \)
(3) \( \frac{100}{3} \)
(4) \( \frac{10}{3} \)
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