A health study reportedthat, in onecountry, systolic blood pressure readings have a mean of 119 and a standard deviation of 18. A reading above 140 is considered to be high blood pressure. Complete parts a through d below

18. A reading above 140 is considered to be high blood pressure. Complete parts a through d below.

a. What is thez-score for a blood pressure reading of140?

z =

(Round to two decimal places asneeded.)

b. If systolic blood pressure in that country has a normaldistribution, what proportion of the population suffers from high bloodpressure?

The proportion with high blood pressure is =

(Round to four decimal places asneeded.)

c. What proportion of the population has systolic blood pressure in the range from 104 to140?

The proportion with systolic blood pressure between 104 and 140 is =

(Round to four decimal places asneeded.)

d. Find the 90th percentile of blood pressure readings.

The 90th percentile of blood pressure readings is =

(Round to the nearest whole number asneeded.)