11.1

Worksheet 11A(page 11.1)

1.(a)

2.(a)Estate A: 40%, estate B: 42%

(b)Yes

3.(a)Not necessary

(b)(i)Organization A: $120000,

organization B: $150000

(ii)No

Worksheet 11B(page 11.5)

1. / Mean / Median / Mode
Adding 5 to each datum / 16 / 17 / 15
Subtracting 4 from each datum / 7 / 8 / 6
Multiplying each datum by 3 / 33 / 36 / 30
Dividing each datum by 2 / 5.5 / 6 / 5

2.(a)Mean73, median75, mode80;

the mean and median will increase,

the mode will remain unchanged

(b)Mean60, median70, mode80;

the mean and median will decrease,

the mode will remain unchanged

Worksheet 11C(page 11.7)

1.(a)Mean64, median72, mode87

(b)Mean: no, median: yes, mode: no

(c)Median

2.(a)20%

(b)Yes

Worksheet 11D(page 11.11)

1.(a)Vincy: 76, Heidi: 77

(b)Heidi

2.3

Build-up Exercise 11A(page 11.13)

1.(a)Tasty: 30000, Cool: 35000

2.(a)3.75%

(b)Yes

3.(a)Model A: 500, model B: 500

(b)Model A: 100%, model B: 62.5%

4.(a)2

(c)Yes

5.Not necessary

6.Not necessary

7.(a)Not necessary

(b)(i)Driving school A: 40%, driving school B: 80%

(ii)Yes

8.(a)Not necessary

(b)(i)Stephen: 66, Eva: 52, Gary: 54, Helen: 58

(ii)No

Build-up Exercise 11B(page 11.17)

9.(a)Mean10, median12, mode8

(b)Mean40, median50, mode30

10.(a)Mean2.75, median2.5, mode2

(b)(i)Mean10.75, median10.5, mode10

(ii)Mean2.25, median2.5, mode3

11.(a)Mean28, median27, mode25

(b)(i)Mean84, median81, mode75

(ii)Mean14, median13.5, mode12.5

12.Mean12, median13, mode10

13.(a)13

(b)52

14.(a)Mean$9300, median$8000, mode$6000

(b)Mean$9800, median$8500, mode$6500

(c)Mean$8370, median$7200, mode$5400

15.Mean30min, median30min, mode30min;

the mean and median will decrease, the mode will remain unchanged

16.Mean162cm, median163cm, mode163cm;

the mean will decrease, the median and mode will remain unchanged

17.(a)Mean18, median21, mode24

(b)Mean6, median7, mode8

18.(a)Mean$4.8, median$4.4, mode$4

(b)The mean will remain unchanged, the median will decrease or remain unchanged, the mode will remain unchanged

19.The mean will decrease

20.(a)Mean18, median18.5, mode21

(b)(i)Mean$4500, median$4625, mode$5250

(ii)Mean$8500, median$8625, mode$9250

Build-up Exercise 11C(page 11.19)

21.(a)Mean70, median70, modes50 and 90

(b)Mode

22.(a)Mean$6000, median$4500, mode$3000

(b)Median

23.(a)Mean(b)No

(c)Median

24.(a)Mode(b)No

25.Yes

26.(a)25%(b)Yes

27.(a)(i)Team A: 700, team B: 600

(ii)Team A;

(b)No

28.(a)Village A:, village B:

(b)No

Build-up Exercise 11D(page 11.22)

29.(a)Volleyball(b)72.5

30.(a)Paper I(b)58.2

31.(a)Ricky: 72.4, Bonnie: 71.5

(b)Ricky

32.(a)Anthea: 68, Gloria: 66, Thomas: 68.5

(b)Thomas

33.7

34.(a)5

(b)14

(c)Pet food B

35.(a)(i)Chloe: 6.2, Terence: 6.4, Jocelyn: 6.6

(ii)Jocelyn, Terence, Chloe

(b)(i)Chloe: 6.8, Terence: 6.6, Jocelyn: 6.4

(ii)Chloe, Terence, Jocelyn

36. / (a) / Subject / Weight
English Language / 3
Chinese Language / 3
Mathematics / 3
Science / 2
History / 2
Visual Art / 1
Music / 1

(b)Jason: 53.8, Mandy: 54.8

(c)No

11.1