Question

The distance between two points is measured as 2.784843 m. This is to be rounded off to 4 significant figures. Hence the value of the distance should be written as
A. 2.784 m
B. 2.785 m
C. 2.7848 m
D. 2.7849 m

Answer 1

Correct Answer - b
As there should be four significant figures in the number 2.784843, the number of digits will be only four. Hence the distance will be 2.784m. We can omit the 6th and 7th numbers i.e. 4 and 3. But the fifth number is 8, which is greater than 5. Hence the fourth number 4, which is to be rounded off should be increased by one i.e. it should be 5.
`therefore` The distance should be written as 2.785 m.