Answer:
3. C.
6. A.
7. B. 7.8 hours
8. B. 44
Step-by-step explanation:
3. A. In order of 1st q., median, 3rd q.:
1.5, 3, 7.5
B. 2, 4, 6
C. 2, 4, 7
D. 2.5, 4, 6.5
6. A. Only asking students that are eating pizza is biased.
B-D. These are all random.
7. Add and divide all numbers.
5 + 6 + 7(5) + 8(9) + 9(2) + 10(2) = 156.
156 ÷ 20 = 7.8
8. Add and divide all numbers.
20 + 25 + 35 + 45(3) + 50(2) + 60(2) = 435.
435 ÷ 10 = 43.5
