Is the process like this: 38+29=67, then 67-23=44
50-44=6
thus possibly A?
we understand that
A fast method for estimating the total of two numbers involves rounding each number and adding the rounded results.
case a) We round to the nearest hundred
so
Round up equals 
Round up equals 
Calculate the estimated sum

case b) We round to the nearest ten
so
Round up equals 
Round down equals 
Calculate the estimated sum

Average occurs most frequently
For the peas, there is no mode since no score appears more than once
The median is the central number
Cross out 4 and 5, and 7 and 8
The median results in 6
The mean represents the average
Sum of 4+5+6+7+8 divided by five
The mean equals 6