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?

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