Random errors can be reduced by_______________?
Correct answer: C. Taking mean of several measurements
- A. Taking zero correction
- B. Comparing the instrument with another more accurate one
- C. Taking mean of several measurements
- D. All methods explained in A, B and C
Explanation
Random errors vary unpredictably from one reading to another, so averaging several readings tends to cancel positive and negative deviations. Zero correction and comparison with a better instrument address systematic error, so students may incorrectly choose d by treating all error-reduction methods as equivalent.
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