Answer : The correct answer is 424.
Explanation :
The following rules are used to round off a number to the required number of significant figures:
(1) If the rightmost digit to be removed is more than 5, the preceding number is increased by one.
(2) If the rightmost digit to be removed is less than 5, the preceding number is not changed.
(3) If the rightmost digit to be removed is 5, then the preceding number is not changed if it is an even number but it is increased by one if it is an odd number.
(4) The same procedure is follow for decimal values.
As we are given, 423.6059
In the given answer, there are 7 significant figures. Now we have to convert it into three significant figures.
According to the rules, round off the given measurement in three significant figures as 424.
Therefore, the correct answer is 424.
