What is the standard deviation of a data set where the values are 2, 4, 6, 8, and 10?
+
Find the length of the major axis of an ellipse with a vertical major axis, when the coordinates of the foci are (0, ±9) and the distance between a focus and a vertex is 15.
+
Question: Using Heron's Formula, find the area of a triangle with side lengths 5, 9, and 11.