Describe the cause of oil spillage

Question

Discuss the below:

Owing to several major ocean oil spills by tank vessels, Congress passed the 1999 Oil Pollution Act, which requires all tankers to be designed with thicker hulls. Further improvements in the structural design of a tank vessel have been proposed since then, each of which the objective of reducing the likelihood of oil spill and decrease the amount of outflows in the event of a hull puncture. To aid in this development, marine technology (Jan, 1995) reported on the spillage amount (in thousands of metric tons) and cause of puncture for 50 recent major oil spills from tankers and carriers. [Note: cause of puncture is classified as collision (C), fire/explosion (FE), hull failure (HF), or grounding (G).]

a- Use graphical method to describe the cause of oil spillage for the 50 tankers. Does the graph suggest that any one cause is more likely to occur than any other? How is this information of value to the design engineers?

b- Find and interpret descriptive statistics for the 50 spillage amounts. Use this information to form an interval that can be used to predict spillage amount of the next major oil spill.

257	Collision
239	Fire
221	HullFail
132	Fire
124	Grounding
123	Collision
101	HullFail
95	Collision
91	Grounding
82	Fire
76	Fire
68	Collision
62	Grounding
58	Grounding
57	Fire
42	Collision
50	Fire
48	Fire
46	HullFail
46	HullFail
45	Grounding
44	Fire
41	Collision
41	Grounding
41	Collision
38	Grounding
37	Grounding
36	Grounding
36	Collision
36	HullFail
33	Fire
32	Collision
32	Fire
32	Fire
32	HullFail
31	HullFail
28	Grounding
31	Collision
25	Unknown
31	HullFail
29	HullFail
31	Grounding
31	Grounding
30	HullFail
27	Unknown
26	HullFail
26	Fire
26	Grounding
24	HullFail
21	Grounding