Final answer:
The typical new house is represented by 'c', which is 100 on the EnerGuide rating scale, indicating average energy efficiency for current building standards.
Step-by-step explanation:
The typical new house reference point on the EnerGuide rating scale is represented by the letter 'c', which corresponds to the number 100. This rating scale is used in Canada to measure a home's energy efficiency. The higher the EnerGuide score, the more energy-efficient the home is. For a new house, a score around 100 is considered typical, indicating a house built to current building standards. However, a much higher-rating signifies a more energy-efficient and better-insulated house. The EnerGuide rating helps homeowners understand how much energy their home uses and allows them to compare with other homes.