Question

Systolic blood pressure has a mean of 80 and a standard deviation of   

               8.

a.   What is the probability a person will have a reading between 75  

      and 85?

2. What is the probability that the average reading of 9 people will be between those values?
3. What  reading would put you in the highest 10% of readings?

Answer 1

be de Lel a variable random Pressure denoting the systolic blood X follows normal distribution with 4 = 80 e 8 p(75 < x <85) =P(75.30 < a < 25-20) (-0'625 « B < 0.625) N = P(3<0.625) - Plak-0.625) 073401 - 0.26599

will follow normal distribution with s 813 85-80 P(75<x<85). PC 75-80 < 3 813 813 P (+187477 <3< 1.87477) - P (3<187477) - P(32-187477) o.030412 096959 .938178 thie 3-value So you are I'281 55 highest X-4 3 x ३.54 80 1'28155x8+ 90'2524