The heights of a certain population of corn plants follow a normal distribution with mean 145 cm and standard deviation of 22cm. What percentage of the heights are:
a) 100cm or more?
b) 120cm or less?
c) between 120cm and 150cm?
d) between 100cm and 120cm?
e) between 150cm and 180cm?
f) 180cm or more?
g) 150cm or less?