HELP! Advance Statistics

In 1990 earthquake data below is the estimated nos. of building survived.

Survival Time Years

0-10
11-20
21-30
31-40
41-50
>51

No of Building survive @beginning of interval

180
165
1120
90
30
4

No of building collapse interval

10
15
9
11
4
2

Compute the following and plot:

a. Hazard Function
b. Relationship of survival function
c. Density Graph
d. Probability Density Function
e. Survivorship function
f. What kind of sensoring principle is being applied in this problem? justify.