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**elomboy** I think I have a good understanding of matrices, but I am having trouble relating it to a word problem. I am given a 5x4 matrix of test scores and asked:

Discuss methods of matrix multiplication that the teacher can use to obtain the information indicated below. In each case, state the matrices to be used and then perform the necessary operations.

a) The average on all four tests for each student, assuming that all four tests are given equal weight.

b) The average on all four tests for each student, assuming that the first three tests are given equal weight and the fourth is given twice this weight

c) The class average on each of the four tests.

Thanks in advance!