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

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

the pseudoscience are like beliefs, theories, or like practices that are considered scientific

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: