Driver’s Age (years)
No. of accidents
18
- 30
30 -50
>50
0
750
1600
1400
1
75
120
120
2
30
50
20
>2
10
15
12
Question 4
[25 Marks]
The following data represent the rainfall (in mm) for the first 20 days of August.
29
18
12
42
25
22
17
9
19
35
27
31
7
16
36
19
52
48
39
29
4.1
What is the lowest rainfall recorded in the first 20 days?
(1)
4.2
What is the median of the rainfall?
(3)
4.3
Calculate for the first quartile; third quartile; and median rainfall for the first 20
days of August.
(5)
4.4
Construct a box-and-whisker diagram for the data.
(4)
4.5
What is the average rainfall for the first 20 days?
(2)
4.6
What is the interquartile range?
(3)
4.7
Calculate the standard deviation for the given data set.
(7)