Find the average thickness of the plate from this data :

Question:

The thickness of a plate is measured to be $2.17 \mathrm{~mm}, 2.17 \mathrm{~mm}$ and $2.18 \mathrm{~mm}$ at three different places. Find the average thickness of the plate from this data.

Solution:

Average thickness

$=\frac{2.17+2.17+2.18}{3}=2.1733 \mathrm{~mm}$

Now we have to round it off to three significant figures. So, after 7 , the digit is 3 . Hence, Average thickness $=2.17 \mathrm{~mm}$.

 

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