Margaret Thatcher uses gas to heat her home and has collected data on her monthly gas bill and monthly heating degree-days. The heating degree-days for a month are calculated by subtracting 65 from the average temperature for each day during that month and then summing these daily amounts.

Here’s the information she has gathered:

Table

Month	Heating Degree-Days	Gas Bill
February	850	$129
April	300	$52

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Margaret Thatchers gas usage heating degreedays and related costs 1 Understanding Heating DegreeDays HDD Heating degreedays are a measure of how much ... View the full answer