Can someone me fill in the and correct me as well

Triangle xyz has vertices x(1,3), y(0,0)

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 the chart is here

3382-299=3383- ? fill in the blank?