Rounding off of data
1. If the first "extra" digit is LESS than 5-drop it.  Now
the last digit of the number remains the same.
Ex. 4.321 becomes 4.32
2. If the first "extra" digit is 5 or MORE than 5,  drop
the number and increase the last significant digit by 1.
Ex. 4.336 becomes 4.34
What is this "even/odd rule" I keep hearing about?
When digit is exactly 5: option will give an even number
as the answer (last digit is 0, 2, 4, 6, or 8). Refer to the
examples above.