A variable is normally distributed with mean 0 and standard deviation 4.
a. Determine and interpret the quartiles of the variable.
b. Obtain and interpret the second decile.
c. Find the value that 15% of all possible values of the variable exceed.
d. Find the two values that divide the area under the corresponding normal curve into a middle area of 0.80 and two outside areas of 0.10. Interpret your answer.