What is the value of k if cos2 x + 12sin x + 12 = 0 is reduced to sin x = −1 or sin x = k?

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