First, make all the denominators same.
Then calculate.
Hopefully this helps :D
well, we can say that 1 hour is 100%, what is 2/5 hr off of it in percentage?

Mean because all of the data points are
fairly close and there aren't any outliers
(extreme values)
The numbers are 6 and 5 because 6-5=1 and 6^2=36 or 6*6=36,5^2=25 or 5*5=25. 36+25=61