Question

Calculate the mean % error in five observations : 80.0, 80.5, 81.0, 81.5, 82

• A. 0.0074
• B. 0.0174
• C. 0.0038
• D. 0.0138

Answer 1

Answer: (A)

0.0074

Answer 2

Mean of the errors = $\frac{80+80.5+81+81.5+82}{5}=81$ |80 - 81| = 1 |80.5 - 81| = 0.5 |81 - 81| = 0 |81.5 - 81| = 0.5 |82 - 81| = 1 Mean error $=\frac{1+0.5+0+0.5+1}{5}=0.6$ $\%$ errors =$\frac{0.6}{81}\times100=0.74\%$