In a sample of 10 patients with the results D,D,A,A,A,A,A,A,D,A, what is the proportion of patients that died?

To determine the proportion of patients that died in the given results, we begin by identifying the outcomes indicated by the letters. Here, "D" represents deceased patients and "A" represents alive patients. In the sample of 10 patients, we can count the occurrences of each outcome.

The outcomes are as follows: D,D,A,A,A,A,A,A,D,A. This indicates that there are 4 "D" (patients who died) and 6 "A" (patients who are alive).

To find the proportion of patients who died, we calculate:

Number of deceased patients = 4
Total number of patients = 10

The formula for the proportion is:

Proportion of deaths = (Number of deceased patients) / (Total number of patients)

Substituting the known values:

Proportion of deaths = 4 / 10 = 0.4

To express this as a percentage, we multiply by 100:

0.4 * 100 = 40%

Thus, the proportion of patients that died is 40%.