Blood pressure drug

A standard drug was administered to patients suffering from high blood pressure, and responses to therapy can be classified into one of four response categories:

C1: Marked decrease in blood pressure (50%);

C2: Moderate decrease in blood pressure (25%);

C3: Slight decrease in blood pressure (10%);

C4: Stationary or slight increase in blood pressure (15%).

A lab conducted a clinical trial with a random sample of 200 patients.