Assignment II

Assignment II - ENGM2032, Applied Probability and...

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ENGM2032, Applied Probability and Statistics Winter 2010 Assignment #2 Due: Mon Jan 18 (Sexton), Tuesday Jan 19 (Studley), 2010 1) Cell phones have unique identifying codes that telephone providers use to identify and locate the caller. Unfortunately, these codes can be picked up off air and used by others to assume your identity and charge large telephone bills to your name (we note the recent court case Rogers was involved in). Suppose that these codes each consist of 8 characters. How many different codes are possible if; a) the codes consist of the digits 0 through 9, b) the codes consist of the digits 0 through 9 and digits cannot be repeated, c) the codes consist of alternating digits and lower case roman letters (e.g. 0a4r7c3u) and digits and letters cannot be repeated, d) if the code is as specified in item (c) and you know the first, second, fourth, and seventh character of the code, what is your chance of correctly guessing the remainder of the code in one thousand tries? 2) In the drive from city A to city D, traffic must pass through cities B then C. Suppose that there are 4 possible routes from A to B, 2 possible routes from B to C, and 3 possible routes from C to D. Suppose further that the average travel times on each of these routes are as follows; A to B: 2.3, 2.6, 2.1, and 3.2 hours, respectively,
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This note was uploaded on 01/29/2010 for the course ENGM 2032 taught by Professor Yao during the Winter '10 term at Dalhousie.

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Assignment II - ENGM2032, Applied Probability and...

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