Question

During one term in Math 310, Min Lee took seven tests, the last of which carried twice the weight of each of the others when averages were computed. Min’s test-score vector for the term was [84,78,91,80,72,88,83]. Show that Min’s final average, a weighted average, can be calculated as a dot product of this vector with another seven-component vector. How can the teacher obtain a class list of test averages by multiplying two matrices?

Answer 1

multiply it by the vertical matrix
1
1
1
1
1
1
2
then you get a sum, divide by 8 and you have the weighted average.

Answer 2

ok thx

Answer 3

wait actually is it divide by 7 or 8? shouldn't it be 7?