The random in the arithmetic mean of 100 \( \mathrm{P} \) observat...

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The random in the arithmetic mean of 100
\( \mathrm{P} \)
observations is \( x \); then random in the
W
arithmetic mean of 400 observations would be
(A) \( 4 x \)
(B) \( \frac{1}{4} x \)
(C) \( 2 x \)
(D) \( \frac{1}{2} x \)
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