The length of an exercise book is given as 20cm correct to the nearest centimeter. In which of the following ranges of possible measurement does the actual length lie?
A
19.5 - 20.4cm
B
19.1 - 20.9cm
C
19.9 - 20.1cm
D
19.95 - 20.05cm
E
19 - 21cm
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
In mathematics, numbers ranging from 0.5 - 0.9 are approximated to 1, while 0.1 - 0.4 are taken down to 0.
Source: Myschool Past Questions Archive (Record #23584)