Please help me to find the solution for following;

Assume an asynchronous communications protocol with 1 start bit, 2 stop bits, 1 parity bit, and 7 data bits. Assume that the start and stop bits are never in error, but for the remaining bits the Bit Error Probability = 0.05 (bit errors are independent).

Then need to be find the probability that a received word is error-free? and

Need to find highest possible probability of bit error if the probability that a received word is error-free must be no less than 0.80?

Assume an asynchronous communications protocol with 1 start bit, 2 stop bits, 1 parity bit, and 7 data bits. Assume that the start and stop bits are never in error, but for the remaining bits the Bit Error Probability = 0.05 (bit errors are independent).

Then need to be find the probability that a received word is error-free? and

Need to find highest possible probability of bit error if the probability that a received word is error-free must be no less than 0.80?

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