Stat 231 Exam 1 F10 Key

Stat 231 Exam 1 F10 Key - Stat 231 Exam 1 Fall 2010 I have...

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1 Stat 231 Exam 1 Fall 2010 I have neither given nor received unauthorized assistance on this exam. ________________________________________________________ Name Signed Date _________________________________________________________ Name Printed
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5 4. A password generator generates passwords of length 7 characters. These characters may be lower case letters (a through z), upper case letters (A through Z), or digits (0 through 9). a) How many different passwords can be generated? b) How many passwords begin with a lower case letter, end with an upper case letter, and contain at least 1 digit? Suppose henceforth that passwords are randomly generated in the sense that each possible password is equally likely to be generated and successive passwords are independent. c) My password is juL765r . A hacker is randomly generating passwords trying to guess mine. What is the expected number of attempts the hacker will have to make in order to get my password? d) What is the conditional probability that the next password generated contains at least 1 digit given that it begins with a lower case letter and ends with an upper case letter?
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This note was uploaded on 02/11/2012 for the course STAT 231 taught by Professor Staff during the Fall '08 term at Iowa State.

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Stat 231 Exam 1 F10 Key - Stat 231 Exam 1 Fall 2010 I have...

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