Dr. Mark Humphrys

School of Computing. Dublin City University.

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Research - PhD - Appendix D - Appendix E

E Weighted sum and weighted mean

Consider a weighted sum of quantities tex2html_wrap_inline9210 :


A weighted mean is a weighted sum where tex2html_wrap_inline9644 such that tex2html_wrap_inline9646 . The ordinary mean is a special case of this with tex2html_wrap_inline9648 . A weighted mean may be greater than or smaller than the mean.

Appendix F

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On the Internet since 1987.

Wikipedia: Sometimes I link to Wikipedia. I have written something In defence of Wikipedia. It is often a useful starting point but you cannot trust it. Linking to it is like linking to a Google search. A starting point, not a destination. I automatically highlight in red all links to Wikipedia and Google search and other possibly-unreliable user-generated content.