According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg (Kuulasmaa, Hense & Tolonen, 1998).Assume that blood pressure is normally distributed.

I believe that letter a is answered correctly. how do I find the rest? an explanation step by step would be best.

a.)State the random variable.

X= Blood pressure for people in China

b.)Find the probability that a person in China has blood pressure of 135 mmHg or more.

c.)Find the probability that a person in China has blood pressure of 141 mmHg or less.

d.)Find the probability that a person in China has blood pressure between 120 and 125 mmHg.

e.)Is it unusual for a person in China to have a blood pressure of 135 mmHg?Why or why not?

f.)What blood pressure do 90% of all people in China have less than?