chemistry

Three part question

Two students each measured the density of a quartz sample three times:
Student A Student B
1. 3.20g/mL 2.82g/mL
2. 2.58g/mL 2.48g/mL
3. 2.10g/mL 2.59g/mL
mean 2.63g/mL 2.63 g/mL

a. which student measured density with the greatest precision? explain your answer.
b. which student measured density with the greatest accuracy? explain your answer.
c. are the errors for these students random or systematic? explain

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