You can estimate the deadliness of each type of cancer by dividing the number of deaths by the number of cases. if nearly everyone who received a diagnosis of one particular type of cancer dies, the ratio will be near 1 (or 100% deadly). if many more people receive a diagnosis than die, the ratio will be near 0 (or 0% deadly).

using this criteria, which two forms of cancer listed are the deadliest? the least deadly? what is the overall ratio for all types of cancer? what does this tell you about cancer survivability in general?

The statistics can be found on the site of World Health Organization (WHO).

Explanation:

The two types of cancer which are the deadliest are listed as Lung Cancer at number one and Colon Cancer at number two with survival rates of below 50% for each of them.

The least deadly cancer type considering early diagnosis is Breast Cancer at stage 0 or 1 with a 5-year survival rate of nearly 100%

The overall survival ratio for all cancer types is around 50% for a 10 year period.

Looking at these statistics, we can say that cancer survivability is increasing and it is key to be able to get an early diagnosis.

I hope this answer helps.