medium · SAT Math

A box plot summarizes the number of books read over the summer by 30 students: Minimum: 0 Q1: 3 Median: 6 Q3: 10 Maximum: 20 Based only on the box plot, which statement must be true?

1. Exactly half of the 30 students read fewer than 3 books.
2. The interquartile range of the number of books read is 20.
3. At least half of the 30 students read 6 or fewer books.
4. The mean number of books read by the 30 students is 6.

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