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Probability Distributions in Statistics II - Assignment 1, Ejercicios de Administración de Empresas

Problems related to probability distributions, specifically poisson distribution and binomial distribution. Students are required to calculate probabilities based on given mean values and apply concepts of poisson and binomial distributions. From applied statistics ii course of academic year 2014/2015.

Tipo: Ejercicios

2017/2018

Subido el 29/05/2018

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!Applied!Statistics!II!(2354)!!
!
Academic!Year!2014/2015!
!!
Assignment!1!
NAME:!______________________________________!SIGNATURE:
ID:!_____________________
!
1. Assume!that!the!number!of!network!errors!experienced!in!a!day!on!a!local!area!
network!(LAN)!is!distributed!as!a!Poisson!random!variable.!The!mean!number!of!
network!errors!experienced!in!a!day!is!2.8.!What!is!the!probability!that!in!any!given!
day:!
a. zero!network!errors!will!occur?!
b. exactly!one!network!error!will!occur!
c. two!or!more!network!errors!will!occur?!
d. less!than!three!network!errors!will!occur?!
e. from!Monday!to!Friday,!15!errors!will!occur?!
!
!
!
!
!
!
!
!
!
!
2. The!quality!control!manager!of!Marilyn's!Cookies!is!inspecting!a!batch!of!chocolateO
chip!cookies!that!has!just!been!baked.!If!the!production!process!is!in!control,!the!mean!
number!of!chip!parts!per!cookie!is!7.0.!What!is!the!probability!that!in!any!particular!
cookie!being!inspected!
a. less!than!five!chip!parts!will!be!found?!
b. exactly!five!chip!parts!will!be!found?!
c. five!or!more!chip!parts!will!be!found?!
d. either!four!or!five!chip!parts!will!be!found?!
e. How!many!cookies!in!a!batch!of!100!should!the!manager!expect!to!discard!if!
company!policy!requires!that!all!chocolateOchip!cookies!sold!have!at!least!four!
chocolateOchip!parts?!
! !
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Applied Statistics II (2354)

Academic Year 201 4 /201 5 Assignment 1

NAME: ______________________________________ SIGNATURE :

ID: _____________________

1. Assume that the number of network errors experienced in a day on a local area

network (LAN) is distributed as a Poisson random variable. The mean number of network errors experienced in a day is 2.8. What is the probability that in any given day: a. zero network errors will occur? b. exactly one network error will occur c. two or more network errors will occur? d. less than three network errors will occur? e. from Monday to Friday, 15 errors will occur?

2. The quality control manager of Marilyn's Cookies is inspecting a batch of chocolate-­‐

chip cookies that has just been baked. If the production process is in control, the mean number of chip parts per cookie is 7.0. What is the probability that in any particular cookie being inspected a. less than five chip parts will be found? b. exactly five chip parts will be found? c. five or more chip parts will be found? d. either four or five chip parts will be found? e. How many cookies in a batch of 100 should the manager expect to discard if company policy requires that all chocolate-­‐chip cookies sold have at least four chocolate-­‐chip parts?

3. The U. S. Department of Transportation maintains statistics for consumer complaints

per 100,000 airline passengers. In 2007, consumer complaints were 1.42 per 100, passengers. What is the probability that in the next 100,000 passengers, there will be: a. no complaints? b. at least one complaint? c. at least two complaints?

4. Errors in a billing process often lead to customer dissatisfaction and ultimately hurt

bottom line profits. An article discussed a company where 40% of the bills prepared contained an error. lf 10 bills are processed, what is the probability that: a. 0 bills will contain an error? b. exactly 1 bill will contain an error? c. 2 or more bills will contain an error? d. What is the standard deviation of the probability distribution?