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The following table shows how many students are there in each grade at a certain high school. In order for a survey of 40 students to be a good basis for drawing conclusions about the general student body of the school, how many 9th graders should be a part of the survey? Write your answer and explain in detail, how you arrived at the answer in the box below.
Write your answer and explain in detail, how you arrived at the answer in the box below.