Chapter 2, Problem 6STP

Interpretation Introduction

Interpretation:

The given problem needs to be solved with correct number of significant figures.

Concept introduction:

Accuracy defined as an accurate measurement that is close to the accepted value whereas, Precision defined as a set of precise measurements that shows a little variation.

The precision of a measurement is denoted by the number of digits reported and the reported digits are termed as significant figures. Significant figures include all known digits plus one estimated digit.

Answer to Problem 6STP

Correct answer: The correct option is (d).

Explanation of Solution

Reason for correct option: All the three measurements need to be aligned on their decimal points and added.

$5.$	$\text{31 cm}$
$8.$	$\text{4 cm}$
$7.$	$\text{932 cm}$
$21.$	$6\text{cm}$

Hence, the correct option is (d).

Conclusion

Thus, 21.6 cm is the answer.