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A group of 50 undergraduate students and their teachers are surveyed. One of the questions asked is about income for which 40 students have none,

A group of 50 undergraduate students and their teachers are surveyed. One of the questions asked is about income for which 40 students have none, 10 students have a small income and the teacher has a large income.

What is the best measure of central tendency to describe the income of a typical person in this survey? Explain your answer.

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