Compute the Hamming code with odd parity for the memory word 1101 1001 0001 1011
They clearly say that the example is only given as an example. If you believe you need 5 parity bits - use 5 bits. They use 4 bits in their example for no good reason.
True, they still wish you to mark it clearly. I guess the reason is (a) to make sure you know that the parity comes in powers of 2, and (b) to ease their grading. note you should not use positions 3,5,11, and 13! these are again only their example, and the note below the example clarifies you need not pay attention to it.


(at least, that's the way that I understand the question. There is a small ambiguity there that allows one to understand it the way you did)