(a) In ordinary English text, the average number of characters per word is 4.5. After indexing, the average length of a dictionary word is 8 characters. Suppose an index has a dictionary with 200,000 words. Assume each character occupies one byte. (i) Explain why the average number of characters per word in ordinary English text is smaller than that in index dictionary. (ii) With index compression, the compressed index stores dictionary as a string with block size of 4 . Estimate the size usage in number of bytes of this dictionary.