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2. We send a frame of 256 bits. If the probability that a bit changes in transmission is 0.001 and each bit is independent. 30 points

a. What is the probability that exactly 6 bits change?

b. What is the probability of no bits changing?

3. If a Signal with a power level of 40 mW is inserted onto a transmission line and the measured power some distance away is 10 mW, calculate the loss of signal strength is decibels.