15110-s13 Corrections for the Data Representation Module

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In the "Learn by Doing" section, the question: "What is the decimal
value of the signed integer 01101011?" says that "+107" is
incorrect. In fact, this is the correct answer.


"Note that the maximum decimal value that can be represented using 8
bits is one less than 27. Also, the minimum decimal value that can be
represented using 8 bits is -27". The 7s in this text should be
exponents. What is meant is 2 to the power 7.


In the "Did I get this" section, the max and min values for 40-bit
signed integers are respectivcely, 2^39-1 2^39. Not 2^40-1 / 2^40
which the module says is the correct answer.



"For example, the letter Q has an ASCII code of 78, so a Q would be
stored in the computer in binary as the sequence 01001110." This
sentence should be talkin about the letter N not Q.


In the "Learn by Doing" section, the question: "Convert the
hexadecimal value 4E3A into the equivalent binary sequence." says that
"0100111000111010" is incorrect. This is in fact the correct answer.


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In the "Learn by Doing" section, the exponent and significand are
incorrect. The significand should be padded with 0s to the right to make it 23 bits, and the exponent should be added with 127.