Question 1112177
Normal curve has mean at 24.5, and -1sd at 18.27, -2sd at 12.04, and -3 sd at 5.81.  It has + 1sd at 30.73, +2sd at 36.96 and +3sd at 43.19
a. z=(x-mean)/sd, which is z > (30-24.5)/6.23 or z > 0.88, probability is 0.1887
b. z <  (10-24.5)/6.23 or z < -2.33, probability is 0.0100
c. z between -0.72 and +0.08, probability is 0.2961
d. top 10% is z=+1.28 or 7.97 above the mean or greater than 32.47 or 32.5
e.  1 and 3 quartiles are +/- z=0.674 or +/- 4.20
Q1 is 20.3
Q2 is 24.5
Q3 is 28.7