Answer:
she should use the measurements of central tendency particularly the mean
Step-by-step explanation:
From the given data sets of test score
15,15,25,60 ,65,76,83,85,85,90
The mean score is
∑test score/no of scores = 599/10
= 59.9
This signifies that the average score is 59.9% slightly above average with this she can persuade them to study harder