Both 3 & 6 are true. if you want to see if the other answers are correct I have a yahoo answers link with the same questions, hope this can help https://answers.yahoo.com/question/index?qid=20090822114504AAoTGrZ
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Answer:6
Step-by-step explanation:
She makes 20 observations in all, because there are 5 groups with 4 students in each group. 5x4=20