Topic : Statistics-Mean, median, and mode
from: category_eng
1.

2.

3.

4.

5.
26000k=3380000, 26k=3380 k= 3380/26
6.

7.

8.
guess what?
9.
(1)30,000=S_r / 1000 (2)35,000=S_~r / x ... We don't know how many in company Q
10.

11.
Median questions require more thinking than average questions.
12.

13.
a-4, a-2, a, a+2, a+4 Numbers have same intervals.
14.

15.

16.
Set Variables
The average of 10, 30, 50 is 30 so that average of 20, 40, x should be 25. That means x can't be more than 25
17.

18.
Focus on sum
19.

20.
divide by 20
21.
(2)T+S=240. so.. one of T or S should be less than 120
22.

23.
focus on sum; 8*12(3/8)+4*15(1/4)
24.
express mathematically.
25.
no info for # of members.. so we can use the variables. Let's combine together. m*25.7 +n*29.3=26.6(m+n) so that you can get m/n...
26.
Focus on sum
27.

28.
Focus on Sum
29.

30.

31.
lower 35% and upper 25%.. So.. what is the other 40% for? 3
32.
Most of median questions require more thinking and understanding.
33.

1. b
2.
3. e
4. C
5. d
26000k=3380000, 26k=3380 k= 3380/26
6.
7.
8. b
guess what?
9. E
(1)30,000=S_r / 1000 (2)35,000=S_~r / x ... We don't know how many in company Q
10. A
11. C
Understanding
Median questions require more thinking than average questions.
12. D
13. D
Understanding
a-4, a-2, a, a+2, a+4 Numbers have same intervals.
14.
Calculation
15. E
16. A
Mathematical Writing
The average of 10, 30, 50 is 30 so that average of 20, 40, x should be 25. That means x can't be more than 25
17. D
18. E
Focus on sum
19. B
20. C
divide by 20
21. B
Understanding
(2)T+S=240. so.. one of T or S should be less than 120
22. D
23. A
focus on sum; 8*12(3/8)+4*15(1/4)
24. B
express mathematically.
25. C
Understanding
no info for # of members.. so we can use the variables. Let's combine together. m*25.7 +n*29.3=26.6(m+n) so that you can get m/n...
to compare two values, we don't need to find indivisual values.

m/n is enough
26. D
Focus on sum
27. B
28. A
Focus on Sum
29. B
30. B
31. C
Understanding
lower 35% and upper 25%.. So.. what is the other 40% for? 3
32. C
Understanding
Most of median questions require more thinking and understanding.
33. C