題組內容

3.(12%)In statistics classes, students work in pairs. One of the classes consists of 51 students, 12 female and 39 male. The teacher selects 2 students at random to get a pair. Answer the following questions, and round the final result to four decimal places.

a. Construct a tree diagram in which all options concerning the gender of the chosen students together with the probabilities are given if the teacher randomly picks two students.