Maurice Tutor

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About Maurice Tutor

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 408 Weeks Ago, 4 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 08 Oct 2017 My Price 5.00

stream of tuples

Suppose we have a stream of tuples with the schema

Assume universities are unique, but a course ID is unique only within a university (i.e., different universities may have different courses with the same ID, e.g., “CS101”) and likewise, student ID’s are unique only within a university (different universities may assign the same ID to different students). Suppose we want to answer certain queries approximately from a 1/20th sample of the data. For each of the queries below, indicate how you would construct the sample. That is, tell what the key attributes should be.

(a) For each university, estimate the average number of students in a course.

(b) Estimate the fraction of students who have a GPA of 3.5 or more.

(c) Estimate the fraction of courses where at least half the students got “A.”

Answers

Maurice Tutor
(5)
Status NEW Posted 08 Oct 2017 08:10 PM My Price 5.00

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