A variable is normally distributed with mean 18 and standard deviation 3.a. Determine the quartiles of the variable.b. Obtain and interpret the 85th percentile.c. Find the value that 65% of all possible values of the variable exceed.d. Find the two values that divide the area under the corresponding normal curve into amiddle area of 0.95 and two outside areas of 0.025. Interpret the answer.