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redroot/gist:4473719

Created January 7, 2013 09:39
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Weighted Mean - Ruby
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gistfile1.rb
# array of arrays
a = [[10, 1000], [9, 923], [8, 1230], [7, 10]] # [data,frequency]
mean = a.reduce(0) { |m,r| m += r[0] * r[1] } / a.reduce(0) { |m,r| m += r[1] }.to_f
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