If the systolic blood pressure for a certain group of obesepeople has a mean of 132 and a standard deviation of 8, find theprobability that a randomly selected obese person will have theseblood pressures. Assume the variable is normally distibuted.

A. Above 130
B. Below 140
C. Between 131 and 136

Question

If the systolic blood pressure for a certain group of obesepeople has a mean of 132 and a standard deviation of 8, find theprobability that a randomly selected obese person will have theseblood pressures. Assume the variable is normally distibuted.
 
A. Above 130
B. Below 140
C. Between 131 and 136

phi · Answer

you need to change the values in A , B and C to standard deviations from the mean, and then use a Z table

anonymous · Answer

i know but i couldnt find the answer for A. the correct answer for A is 0.5987.
i got 0.6368. where did i go wrong?

phi · Answer

how many std dev is 130 from 132?

anonymous · Answer

oh its okay i got the answer. thanks anyway for trying to help!

phi · Answer

it looks like you used 0.35 rather than 0.25 for the std dev for A