Test 1 VerA Solutions

Test 1 VerA Solutions - STAT 230 Test #1 Sept 25, 2008 3:30...

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STAT 230 Test # 1S e p t 2 5 , 2008 3 : 30 4 : 20 pm mark ____/ 19 A Name : Student I . D : UW computer userid : Circle your section and time slot : 1 . McLeish ( 12 : 30 ) 2 . McLeish ( 12 : 30 ) 3 . Freire ( 1 : 30 ) 1 . Three different letters are distributed at random into 4 mailboxes by choosing one of the four mailboxes at random for each of the letters. ( 3 ) a . Give a possible sample space for this problem. How many points are in the sample space? For each letter we have a choice of 4 different mailboxes so the sample space is S  1,1,1 , 1,1,2 ,....... 4,4,4  denoting the mailbox number for each of the three letters. There are 4 3 points in S . ( 2 ) b . Find the probability that the first mailbox is empty. There are 3 3 ways of distributing the letters in mailboxes 2,3, and 4. There are 4 3 ways of distributing the letters in all four boxes. Therefore the probability mailbox 1 is empty is 3 3 4 3 ( 2 ) c . Find the probability that no mailbox contains more than one letter.
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Test 1 VerA Solutions - STAT 230 Test #1 Sept 25, 2008 3:30...

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