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The heating bills for a selected sample of houses using various forms of heating are given below (values are in dollars). Gas Heated Homes Central

The heating bills for a selected sample of houses using various forms of heating are given below (values are in dollars).

Gas Heated Homes	Central Electric	Heat Pump
83	90	81
80	88	83
82	87	80
83	82	82
82	83	79

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