Marco Delaurenti mfdela
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| #!/usr/bin/ruby | |
| class Array | |
| def sum | |
| inject( 0 ) { |sum,x| sum+x } | |
| end | |
| def sum_square | |
| inject( 0 ) { |sum,x| sum+x*x } | |
| end | |
| def mean |
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