Jonathan MathDude discovers that the distribution of heights of students in his class is normally distributed with a mean of 173.2 cm and a standard deviation of 11 cm. Answer the following questions about the distribution of heights for Louis' class:

a) What percent of heights are below 186 cm?

b) What percent of heights lie between 169 cm and 181 cm?

c) What percent of heights lie above 188 cm?