True value = mean of all observations
Mean absolute error = mean of all absolute errors
Percentage error = ×100%
aₘ = = 2.0
Δa₁ = |1.9 – 2.0| = 0.1
Δa₂ = |2.0 – 2.0| = 0.0
Δa₃ = |2.1 – 2.0| = 0.1
Relative error, 
%error = 0.03 × 100 = 3 %
Choose the correct statement.
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