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Saying that a number is signed means it must be positive or negative. This simply excludes the possibility that the number is zero.
If the 8 bits represent a signed number, the range is usually -128 to +127. This is -27 to 27-1.
No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).
111100002 equals 24010 using unsigned notation. It equals -1610 using signed notation.
27.9 IS a decimal number. You can tell it is a decimal number because it has a decimal point (.).