Fiona recorded the mean math exam grade for six random samples of students from the entire seventh-grade class.

Sample
Sample Mean Grade
1
65
2
92
3
78
4
45
5
95
6
70

Why is a valid prediction for the mean of the population not possible using these samples?
Fiona had too many samples.
Fiona didn’t have enough samples.
The variation of Fiona’s samples is too large.
The variation of Fiona’s samples is too small.