Quiz2-sec2-Questions&amp;Solutions

# Quiz2-sec2-Questions - Name-Surname Student ID MIDDLE EAST TECHNICAL UNIVERSITY – NORTHERN CYPRUS CAMPUS SPRING 2011 BUS 152 Statistics for

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Unformatted text preview: Name-Surname: Student ID: MIDDLE EAST TECHNICAL UNIVERSITY – NORTHERN CYPRUS CAMPUS SPRING 2011 BUS 152 Statistics for Social Sciences Quiz 2 – Section 2 Questions and Solutions 1. An internal study by the information technologies department of a company revealed that the company employees receive an average of 2 e-mails per hour. Assuming that the arrival of e-mails is approximated by the Poisson distribution, answer the following questions: a. What is the probability that a company employee will receive exactly one email between 4 P.M. and 5 P.M. tomorrow? b. What is the probability that a company employee will receive exactly two emails between 1 P.M. and 3 P.M. tomorrow? c. What is the probability that a company employee will receive at most one email between 4 P.M. and 5 P.M. tomorrow? d. What is the probability that a company employee will receive at least one email between 4 P.M. and 5 P.M. tomorrow? Let X be the number of e-mails received a. ( ) , Between 4 P.M. and 5 P.M. average number of e-mails received per hour ( b. 1 hour. ) ( ) , Between 1 P.M. and 3 P.M. average number of e-mails received per two-hour ( ( c. ( ) ) ) ( ) , ( ( 2 hours. ( )( ) ) ( ) ( ) , ) ( 1 ) 2. A recent study in USA indicated that a typical family of four spends \$490 per month on food. Assuming that the distribution of food expenditures for a family of four follows the normal distribution with a mean of \$490 and a standard deviation of \$80, answer the following questions: a. What is the probability that a family of four spends less than \$370 per month on food? b. What is the probability that a family of four spends more than \$540 per month on food? c. What is the probability that a family of four spends between \$650 and \$500 per month on food? d. The food expenditures for a family of four are less than how many dollars with 97% probability? and Let X be the food expenditures (in dollars) for a family of four. b. ( ) ( a. ) ( ) ( ( c. ) ( from Table E.2, p.812 ( ) ( ) ) ( ) ( d. ) ( ( ) ) ( ) ) ( ) ( ) 0.97 corresponds to Z = 1.88 (from Table E.2, p.813) ( )( ) 2 ( ) ...
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## This note was uploaded on 12/22/2011 for the course BUSINESS bus 152 taught by Professor Çeşmecibaşı during the Spring '11 term at Middle East Technical University.

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