1.
|
Number of cans (x)
|
frequency (f)
|
f . x
|
|
10
|
2
|
20
|
|
11
|
1
|
11
|
|
12
|
0
|
0
|
|
13
|
3
|
39
|
|
14
|
2
|
28
|
|
15
|
4
|
60
|
|
16
|
5
|
80
|
|
17
|
1
|
17
|
|
18
|
1
|
18
|
|
19
|
1
|
19
|
|
20
|
1
|
20
|
|
Total
|
21
|
312
|
Mean = 312 ÷ 21 = 14.9 (to 3 sig.fig.)
2.a. 
b. 597 household.
c. The mode number of cars is 1.
The median is 1
|
Number of cars
|
Frequency (f)
|
f.x |
|
0
|
87
|
0 |
|
1
|
324
|
324 |
|
2
|
158
|
316 |
|
3
|
23
|
69 |
|
4
|
5
|
20 |
|
Total
|
597
|
729
|
The mean is 729 ÷ 597 = 1.22 (to 3 sig. fig.)
3. a.
|
Height (cm)
|
Frequency (f)
|
|
150 − 160
|
2
|
|
161 − 170
|
3
|
|
171 − 180
|
4
|
|
181 − 190
|
6
|
|
191 − 200
|
5
|
b. 
c. 
d. The modal interval is 181 − 190 cm
