Check our 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 mean 80.4 mmHg and a standard deviation of 9.8 mmHg. Round the answers to four decimal places.

a) what proportion of women have blood pressures lower than 65mmHg?
b) What proportion of women have blood pressure between 7mmHg and 90 mmHg?
c)A diastolic blood presser greater than 90 mmHg is classified as hypertension(High blood pressure). What proportion of women have hypertension?
D) Is it unusual for a woman have a blood pressure lower than 63mmHg? And what is the probability?