Spring2010Exam2

# Spring2010Exam2 - STAT 225 Spring 2010 Exam 2 Your Name...

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STAT 225 Spring 2010 Exam 2 Your Name: _________________________________________________________ Your Instructor: _____________________________________________________ Your class time (circle one): 7:30 8:30 9:30 10:30 11:30 12:30 1:30 2:30 3:30 4:30 Show work for full credit unsupported work will NOT receive full credit All answers should be in decimal form : no fractions, permutation, combination, or exponential form. Round all answers to at least 2 decimal places . You are responsible for upholding the Honor Code of Purdue University. This includes protecting your work from other students. You are allowed 1 page 8.5”x11” handwritten cheat sheet and a calculator . Instructors will not interpret questions, tell you i f you’re on the right track, or check any answers for you. Only legitimate questions will be answered. You must turn in your Cheat Sheet at the end of the exam and may be asked to show your student ID. Turn off your cell phone before the exam begins. Question Points Possible Points Received 1 18 2 12 3 10 4 8 5 10 6 10 7 8 8 13 9 10 Cheat Sheet 1 Total 100

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1. Dawn and Bill are getting married in June and are planning their reception. All guests choose their meal choice independently of one another. It is known that 20% of all guests will order the salmon, 45% of all guests will order the chicken and 35% will order steak. For each of the following scenarios, state the distribution and parameters. If an approximation is appropriate, state the exact and approximate distributions for full credit. (3 points each) a. There are 7 groomsmen and 7 bridesmaids in the wedding party. Four of them are chosen to help guests find their tables. Let X be the number of bridesmaids chosen.
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