Hourly temperature data for Boulder, Colorado, San Francisco, California, Nantucket, Massachusetts, and Duluth, Minnesota, over a 12 hr period on the same day of January are shown in the figure. Assume that these data are taken from a continuous temperature function T(t). The average temperature over the 12-hr period is

Find an accurate approximation to the average temperature over the 12-hr period for San Francisco. State your method.

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12 T(t) dt. т: 12 || TA 70 Boulder 60 50 San Francisco 40 30 Nantucket 20 Duluth 10 + + 4 6. 10 12 Hours after 6:00 A.M. 2. + Temperature