High blood pressure:A national survey reported that31

%

of adults in a certain country have hypertension (high bloodpressure).A sample of21

adults isstudied.Round the answer to at least four decimal places.

Part 1 of 4

(a) What is the probability that exactly6

of them havehypertension?The probability that exactly6

of them have hypertension is

.

Part 2 of 4

(b) What is the probability that more than6

have hypertension?The probability that more than6

have hypertension is

.

Part 3 of 4

(c) What is the probability that fewer than3

have hypertension?The probability that fewer than3

have hypertension is

.

Part 4 of 4

(d) Would it be unusual if more than8

of them have hypertension?It

(Choose one)

be unusual if more than8

of them have hypertension since the probability is

.