If the random error in the arithmetic mean of $50$ observations is $\alpha$, then the random error in the arithmetic mean of $150$ observations would be
If the random error in the arithmetic mean of $50$ observations is $\alpha$, then the random error in the arithmetic mean of $150$ observations would be
- A
$\frac{\alpha}{3}$
- B
$3 \alpha$
- C
$\alpha$
- D
$2 \alpha$
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