Please help me T-T.

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

15 points ! ~ see if you know the answer to both you!

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