Final answer:
The amplitude of an ocean wave with a peak-to-trough height of 15 meters is 7.5 meters, as amplitude is half the total height.
Step-by-step explanation:
The amplitude of a wave is defined as half the peak-to-trough height. Therefore, if a wave on the ocean measures 15 meters in height from peak to trough, the amplitude of the wave is half of this measurement, which would be 7.5 meters. This information can be crucial for estimating the energy and power of waves, as well as for safety and engineering concerns regarding marine structures and navigation.