Final answer:
In order to check for errors at the receiver, we can use a technique called parity checking. This involves adding an extra bit to the message that represents whether the number of ones in the message is odd or even.
Step-by-step explanation:
In order to check for errors at the receiver, we can use a technique called parity checking. Parity checking involves adding an extra bit to the message that represents whether the number of ones in the message is odd or even. This extra bit is known as the parity bit.
In this case, the incoming message is 1111100111. Let's assume we are using even parity. We count the number of ones in the message, which is 7, an odd number. Since we are using even parity, we need to add an extra 1 to the message to make the total number of ones even.
So, the modified message becomes 11111001111. At the receiver, the same parity checking technique is used. If the number of ones in the received message is even, it means there is no error. However, if the number of ones is odd, it indicates an error in the transmission.