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Nature of Physical World and Measurement — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsNature of Physical World and Measurement1 Mark
MCQ
The random error in the arithmetic mean of 50 observations is ‘a’, then the random error in the arithmetic mean of 200 observations a would be
  • A
    $4 a$
  • B
    $16 a^2$
  • ✓
    $\frac{a}{4}$
  • D
    $\frac{a}{2}$
✓

Answer

Correct option: C.
$\frac{a}{4}$
$\frac{a}{4}$

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