Multiple choice

Suppose the values obtained in several measurements are a1, a2, a3...., an. If the arithmetic mean of these values = a mean, what will be the formula to find the error in the third measured value?

  1. a3

  2. (a1 + a2 + a3)/an

  3. a mean - a3

  4. a mean/ a3

  5. none of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. The formula to find out error in the individual measurement values is - Δ a1 = a mean – a1,          Δ a2 = a mean – a2,          Δ a3 = a mean – a3,       -------------------------      -------------------------      

         Δ an = a mean – an