Given \sin\theta=-\frac{\sqrt{24}}{5}sinθ =− 5 24 ​ ​ and angle \thetaθ is in Quadrant IV, what is the exact value of \cos\thetacosθ in simplest form? Simplify all radicals if needed.

The owner of a coffee shop compared the amount of hot coffee per day, in fluid ounces, sold and the daily high temperatures, in degrees fahrenheit, per day. her data are shown in the scatter plot below