The value is 0.02
If it is a negative number, you move the decimal over to the left. :)
The new mean is 66.09
<u>Explanation:</u>
Mean weight of 20 students = 65kg
One student with 88kg entered the room.
New mean = ?


The above equation can further be written as:

New mean = 
= 66.09
Therefore, the new mean is 66.09
6.0 because if it is 0-4, you round down and 5-9, round up