The average monthly mortgage payment including principal and interest is $982 in the US. If the standard deviation is approximately $180 and the mortgage payments are approximately normally...

1. The average monthly mortgage payment including principal and interest is $982 in the US. If the standard deviation is approximately $180 and the mortgage payments are approximately normally distributed, find the probability that a randomly selected monthly payment is

(a) More than $1000

 (b) More than $1475

(c) Between $800 & $1150