A logic 0 is transmitted at a nominal level of -1.0 V, and a logic 1 is transmitted at a nominal level of 1.0 V. If a 250-mV RMS Gaussian noise signal is assumed to be present at the receiver, what is the probability of making an single trial bit error if the detector threshold is set at 0.0 V. Assume that a logic one has twice the probability of being transmitted than a logic zero