3P We have carried out a statistical knowledge test for students who want to study Marketing, and it is observed that the scores obtained follow a normal distribution N(65, 18). It is desired to classify the examinees into three groups (those who know almost nothing, those who know a little, those who know basic statistics) so that there are 20% of the students in the first group, 65% the second and 15% in the third. What must be the cut-off scores from one group to the other to meet those percentages