Im looking back over an old assignment and I cant figure out how to get the correct probability
Question: what is the probability of encountering a state with annul income less than ore equal to Maine?
Maine: (19590- 21856)/3537.59= - .64
(Maines income - mean) / standard deviation
go to the ztable, and the area associated with -.64 is .2611
then somehow I came up with a probability value of 26.43%, which is the correct answer but I have no idea how to get this probability value.
Please help