Q9Digital Electronics

To correctly decode the Excess-3 string 0100 1000 . 0111 1001 back to standard decimal, we must mathematically subtract 0011 (decimal 3) from every discrete 4-bit nibble. Left of the radix: $0100-0011=0001$ (1); $1000-0011=0101$ (5). Right of the radix: $0111-0011=0100$ (4); $1001-0011=0110$ (6). The final answer is $15.46_{10}$.