# Time for 20 oscillations of a pendulum is measured as . What is the precision in the measurements? What is the accuracy of the measurement?

Given data :

and

L.C. of the instrument is 0.1 sec, hence Precision (LC) = 0.1 sec.

Now,

For 20 oscillations, the mean value will be

$=\frac{39.6+39.9+39.5}{3}$

Now the absolute errors in measurement

$\left | \Delta t_{3} \right |=\left | \bar{t}- t_{3}\right |=\left | 39.7-39.5 \right |=\left | 0.2 \right |=0.2\; s$

Now, Mean absolute error $=\frac{0.1+0.2+0.2}{3}$

& Accuracy of measurement

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