The probability of detecting an error, given that one has occurred, using parity checking is about:
A)100%
B)0%
C)50%
D)75%
E)98%

Question

Quizplus · Accepted Answer

Parity checking can detect an error if there is an odd number of bit errors in the data. If there is an even number of bit errors, parity checking cannot detect the error. Therefore, the probability of detecting an error given that one has occurred is 50%, assuming an equal chance of odd and even bit errors occurring.

The Probability of Detecting an Error, Given That One Has