Asampleof 35 observations has the mean 80 and s.d. as4.Asecond samp...

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Asampleof 35 observations has the mean 80 and s.d. as4.Asecond sampleof 65 observation from the
\( \mathrm{P} \) same population has mean 60 and s.d. 3. The s.d. of the combined sample is
(A) \( 5.85 \)
(B) \( 5.58 \)
(C) \( 10.12 \)
(D)Noneofthese
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