4.2. A continuously operating coherent BPSK system makes errors at the average rate of 100 errors per day. The data rate is 1000 bits/s. The single-sided noise power spectral density is No 10-10 W/Hz. (a) If the system is ergodic, what is the average bit error probability? (b) If the value of received average signal power is adjusted to be 10 W, will this re- ceived power be adequate to maintain the error probability found in part (a)?