A Canadian Medical Association Study Showed That 20% of All

Essay

A Canadian Medical Association study showed that 20% of all Canadians suffer from high blood pressure. Suppose we randomly sample ten Canadians to determine the number in the sample who have high blood pressure.
a. What is the probability that, at most, two persons have high blood pressure?
b. If, instead, we sampled 25 Canadians, give a reason why the following statement is true: "The probability between one and nine individuals from a sample of 25 would have high blood pressure is at least 0.75." [Hint: For n and p of approximately the sizes given, the distribution would not be particularly symmetric.]