Answer:
4 stations
Step-by-step explanation:
If we need to be at least 98% certain that an enemy plane flying over will be detected by at least one station, we must ensure that there is at most a 2% chance that no radar stations detect the plane.
The probability that a single radar station does not detect the plane is 0.35.
For n radar stations:
[tex]P=0.02=0.35^n\\n=\frac{log(0.02)}{log(0.35)}\\n=3.73[/tex]
Rounding up to the next whole station, at least 4 stations are needed.
