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Here is the homework problem. Basically, I have no idea how to get top 100 out of 400 homes just from a box plot. Not really looking for the answer explicitly, but I want to know how to read it or guess the answer.

The following box plot was prepared based on data collected for a sample of 400 homes in zipcode 12345 and represents the distribution of the number of days that a home was on the market before being sold. According to the graph, the 100 homes that were on th emarket for the longest time were on the market for more than _____ days.

A box plot with 5-number summary (50, 90, 110, 150, 210)

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Look at a textbook or Wikipedia to remind yourself how a boxplot is constructed. Given that there are 400 homes overall, how many homes will lie in each region of the boxplot?

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