Exam Scores A large physics class takes a survey of the number of hours the students slept before an exam and their exam scores. Matrix A summarizes the proportions of stu- dents in different categories of exam scores and hours of sleep. Matrix B shows the total number of students in three exam score categories. (a) Calculate the product matrix AB. (b) Interpret the entries of the matrix AB. Exam Score Below 60 60 to 80 Above 80 Less than 4 0.75 4 to 7 0.60 More than 7 0.40 0.20 0.05 0.30 0.10 = A 0.30 0.30 Total Below 60 80 60 to 80 170 %3D Above 80 40

Exam Scores A large physics class takes a survey of the number of hours the students slept before an exam and their exam scores. Matrix A summarizes the proportions of stu- dents in different categories of exam scores and hours of sleep. Matrix B shows the total number of students in three exam score categories. (a) Calculate the product matrix AB. (b) Interpret the entries of the matrix AB. Exam Score Below 60 60 to 80 Above 80 Less than 4 0.75 4 to 7 0.60 More than 7 0.40 0.20 0.05 0.30 0.10 = A 0.30 0.30 Total Below 60 80 60 to 80 170 %3D Above 80 40

Algebra and Trigonometry (6th Edition)

6th Edition

ISBN:9780134463216

Author:Robert F. Blitzer

Publisher:Robert F. Blitzer

ChapterP: Prerequisites: Fundamental Concepts Of Algebra

Section: Chapter Questions

Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...

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Question

Exam Scores A large physics class takes a survey of the
number of hours the students slept before an exam and their
exam scores. Matrix A summarizes the proportions of stu-
dents in different categories of exam scores and hours of
sleep. Matrix B shows the total number of students in three
exam score categories.
(a) Calculate the product matrix AB.
(b) Interpret the entries of the matrix AB.
Exam Score
Below 60
60 to 80
Above 80
Less than 4 0.75
4 to 7 0.60
More than 7 0.40
0.20
0.05
0.30
0.10 = A
0.30
0.30
Total
Below 60
80
60 to 80 170
%3D
Above 80
40

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