1.

In an experiment with common balance the mass of a body is found to 2.52g, 2.53g, 2,51g, 2.49g and 2.54g in successive measurements. Calculate1. The mean value of the body2. Mean absolute error3. Percentage error

Answer»

1. Mean value, Mmean

\(\frac{2.52+2.53+2.51+2.49+2.54}{5}\)

= 2.5g

2. Absolute error,

Absolute error ∆m1 = |2.52 – 2.52| = 0

∆m2 = |2.52 – 2.53| = 0.01

∆m3 = |2.52 – 2.51| = 0.01

∆m4 = |2.52 – 2.49| = 0.03

∆m5 = |2.52 – 2.54| = 0.02

∴ Mean absolute error

\(\frac{0+0.01+0.01+0.03+0.02}{5}\)

∆mmean = 0.014g

3. Percentage error = \(\frac{Δm_{mean}}{m_{mean}}\) × 100

\(\frac{ 0.014}{2.52}\) × 100 = 0.556.



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