Math for educators
posted by Anonymous .
The length of time it takes college students to find a parking spot in the library parking lot follows a
normal distribution with a mean of 5.5 minutes and a standard deviation of 1 minute. Find the
probability that a randomly selected college student will take between 4.0 and 6.5 minutes to find a
parking spot in the library lot.

45.5 = 1.5
z =1.5/1 = 1.5 or 1.5sigma below mean
6.5  5.5 = 1
z = 1/1 = 1 sigma above mean
so what fraction of a normal distribution lies between z = 1.5 and z = + 1?
from table
F(1.5) = .067 are below 1.5
F(1) = .841 are below +1
so .842.067 are between