Find the exact value of the following expression without using a calculator. Note: Enter an exact simplified answer with no decimals. Use pi for r if necessary.
Enter none if there is no answer.

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at __ link to graph: .