Answer:
10.0 mW
Step-by-step explanation:
By definition, the SNR of any system is expressed as follows:

where
S = average power of the signal
N= average noise power
In this case this relationship can be written as follows, repalcing by the givens:

Rearranging terms, and taking log₁₀ on both sides, we have:

⇒ Pavg = 10 mW