An iceberg consists of frozen freshwater that has broken away from a glacier, and could be more than 15,000 years old. icebergs in the grand banks area are estimated to weigh between 100,000 and 200,000 tons. suppose a team of scientists aboard a research vessel operating in the grand banks area selects a random sample of 49 icebergs. the height is carefully measured for each, and the sample mean is