TABLE 2-5
The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Table 2-5, if 100 calls were sampled, ________ of them would have lasted less than 15 minutes.
Definitions:
Mitochondria
Membrane-bound cell organelles that produce most of the chemical energy needed to power the cell's biochemical reactions.
Earth's Early History
A period spanning from the formation of Earth about 4.5 billion years ago to the first appearance of abundant, complex life approximately 541 million years ago.
Bombardments
Intense and frequent attacks or hits, often used in the context of celestial bodies impacting a planet.
Plate Tectonics
A scientific theory explaining the motion of the Earth's lithosphere, which is divided into tectonic plates that move over the mantle, leading to many Earth's surface features.
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