A national study of patients who were overweight found that

A national study of patients who were overweight found that 61% also have elevated blood pressure. If four overweight patients are selected, find the probability that all four have elevated blood pressure. Express your answer to four decimal places. The probability that all four patients have elevated blood pressure is

Solution

Here selecting each person is an independent event, or selecting one person, will not effect the probability of selecting other person.

And the probability of each persons, being elevated blood pressure is given as 0.61.

Thus total probability that all the four persons will have elevated blood pressure

= 0.61 x 0.61 x 0.61 x 0.61

= 0.1385

that is last required answer.