Check your blood pressure: In a recent study, the Centers for Disease Control and Prevention reported that diastolic blood pressures of adult women in the United States are approximately normally distributed with mean80.6 and standard deviation10.

(a) What proportion of women have blood pressures lower than67?

(b) What proportion of women have blood pressures between74 and92?

(c) A diastolic blood pressure greater than90 is classified as hypertension (high blood pressure). What proportion of women have hypertension?

(d) Is it unusual for a woman to have a blood pressure lower than66?

Round the answers to four decimal places.