Lesson Objectives. 1  List the main features of the seafloor: mid-ocean ridges, deep sea trenches, and abyssal plains. 2  Describe what seafloor magnetism tells scientists about the seafloor. 3  Describe the process of seafloor spreading.
Assignment Help. The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters. If 9 sand dollars are chosen at random for a collection, find the probability that the average diameter of those sand dollars is more than 4.13 centimeters.he average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters.
The words one dollar will typically appear but 1oz fine silver will not. The silver eagle, a bullion coin, is slightly larger and heavier: 40.6mm (1.598 in) in diameter and 2.98mm (0.1193 inches) thick. The commemorative silver dollars are 38.1mm (1.500 inches) in diameter and weigh 26.73 grams.