Question

1 nonadhesive technique to detect stroke in patients measures cerebral blood flow in the brain because stroke patients tend to have lower CBF levels than normal assume that in the general population CBF is normally distributed with a mean of 74ml/100g and a standard deviation of 19ML/100G brain tissue. A patient is classified as being at risk for stroke if his or her see be able were then 39ml/100g brain tissue what percentage of people are not at risk of a stroke round final answer to 2 decimal place type  

So ____________of people are not at risk for a stroke

Answer 1

the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2
standard normal distribution is a normal distribution with a,
mean of 0,
standard deviation of 1
equation of the normal curve is ( Z )= x - u / sd ~ N(0,1)
mean ( u ) = 74
standard Deviation ( sd )= 19

percentage of people are not at risk of a stroke 39ml/100g brain tissue
because stroke patients tend to have lower CBF levels than normal assume that in the general population
P(X < 39) = (39-74)/19
= -35/19= -1.8421
= P ( Z <-1.8421) From Standard Normal Table
= 0.0327
= 3.27% of people are not at risk for a stroke