Final answer:
The interference value of 30% in a mapping experiment indicates the degree to which the interference is occurring.
Step-by-step explanation:
The interference value of 30% in a mapping experiment indicates the degree to which the interference is occurring. In this case, it means that 30% of the waves are constructive, resulting in a stronger signal, while the remaining 70% are destructive, leading to a weaker signal. This interference could be due to various factors such as distance, obstacles, or wave properties.