The serum cholesterol levels of the 12 to 14 years olds follow normal distribution with mean 162mg/dl and standard deviation 28mg/dl. Determine percentage of 12 to 14 years olds have serum cholesterol values?
a) 171 or more?
b) 143 or less?
c) 194 o less?
d) 105 or more?
e) between 166 and 194?
f) between 105 and 138?
g) 138 and 166?