Two student groups of 40 students each scored, respectively, between 45% to 85% (first group) and 55% to 90% (second…
Two student groups of 40 students each scored, respectively, between 45% to 85% (first group) and 55% to 90% (second group) on the test. A paper is randomly chosen from the two groups and shows the score of 78%. What is the probability that the paper has been chosen from the first student group?
