5. Find the run-time efficiency of the following program segments i) // Calculate mean sum - 0; x= System.in.read(); while (x !--999) { sum +-x; x-System.in.read(): mean-sum/n; 5. Find the run-time efficiency of the following program segments i) // Calculate mean sum - 0; x= System.in.read(); while (X != -999) { sum +-x; x-System.in.read(): mean - sum/n;