I am not sure how to even go about solving this.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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I am not sure how to even go about solving this. 

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Weighted Average:

The following is the formulae to calculate Weighted Average (W)

                                                         W=n1 x1+n2 x2+n3 x3n1+n2+n3

Here, n1, n2, n3 are the number of observations i.e., number of ninth graders

         x1, x2, x3 are the mean test scores

 

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