Fiona recorded the mean math exam grade for six random samples of students from the entire seventh-grade class. Sample Sample Mean Grade165292378445595670Why is a valid prediction for the mean of the population not possible using these samples?
A
Fiona had too many samples.B
Fiona didn’t have enough samples.C
The variation of Fiona’s samples is too large.D
The variation of Fiona’s samples is too small.