Assessment Item 2 Assessment 2 Value: 20% Due date: 10-

Assessment Item 2 Assessment 2 Value: 20% Due date: 10-Dec-2012 Return date: 31-Dec-2012 Submission method options EASTS (online) Task Task 1: 20 marks a) Consider the table in Figure 2.6 showing the relative frequencies of letters in English. Arrange the frequencies from largest to smallest and make a cumulative plot using Excel for example. Which smallest group of letters accounts for at least 50% of all letters used in English? b) An affine cipher scheme can be mathematically expressed in the following form ?? ?? = ???? + ?? mod 26. Here ?? and ?? are numbers selected in the range 1 = ?? ??

Attachments: