Use the information provided to write the standard form equation of each ellipse. 11) Vertices: (11, 5), (1,5)
12) Vertices: (-4, 11),(-4,-15)
Foci: (9,5), (3,5)
Foci: (-4, 10), (-4, -14)

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?