Answer :
Answer:
the standard deviation
Explanation:
Based on the scenario being described within the question it can be said that the most valuable statistic for this scenario would be the standard deviation. This statistic indicates the amount of variation that exists within a set of data. Therefore it is the most important statistic for Roderick since it will allow him to see how accurate the data he has gathered is when dealing with the skills of all of the children present in each school.