Four students obtained the following measurements for a ruler. The actual length was 30.5 cm. Each student measured the ruler 4 times. Which of the following statements regarding their measurements are correct?
Student
Ruler
Measurements
Student 1
31.5
31.4
31.5
31.4
Student 2
30.4
30.5
30.4
30.4
Student 3
30.02
30.25
30.18
30.07
Student 4
28.5
28.7
28.7
28.6
I. Student 1's measurements were precise, but not accurate,
II. Student 2's measurements were both accurate and precise.
III. Student 3's measurements were accurate, but not precise.
IV. Student 4's measurements were precise, but not accurate.
DI
11
III
V