The table below shows the number of bicycles sold from a shop during 7 weeks:
Week
1
2
3
4
5
6
7
Number of bicycles sold
60
70
80
100
50
20
10
(i) How many bicycles bicycles were sold during the sixth week?
(ii) During how many weeks were at least 40 bicycles sold?
(iii) During which all weeks were more than 50 bicycles sold?
(iv) Draw a line graph showing these details.