STATISTICS AND PROBABILITY 2 The table shows the distances walked (in kilometers) by members of a
walking group in one week
Cumulative frequency
Distance, d (k/m)
0<d<3
3<d<6
6<d< 9
9<d<12
12 <d<15

Frequency
4
14
6
8
4

Cumulative frequency

a Copy and complete the table
b Construct a cumulative frequency curve to represent this data
c Find estimates for the median and quartiles,
d Find estimates for the range and interquartile range