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 randomly sampled, ________ of them would have lasted at least 15 minutes but less than 20 minutes.
Definitions:
Coccyx
The coccyx, commonly known as the tailbone, is the small, triangular bone at the bottom of the spine, consisting of several fused vertebrae.
Vertebral Column
The flexible column formed by a series of bones called vertebrae, extending from the skull to the pelvis, and playing a key role in support and motion.
Vertebral Column
The series of vertebrae extending from the skull to the lower back, encasing the spinal cord and providing structural support.
Spinal Nerves
Nerves that originate from the spinal cord and branch out to various parts of the body, facilitating communication between the brain and the rest of the body.
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