Quiz2-sec2-Questions&Solutions

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 ( ) ...
View Full Document

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.

Ask a homework question - tutors are online