3-column table with 10 rows. First column labeled x subscript i with entries 5.07, 3.57, 5.32, 3.19, 3.49, 4.25, 4.76, 5.19, 3.94, 4.34. Second column labeled (x subscript i minus x-bar) with entries 0.758, negative 0.742, 1.008, negative 1.122, negative 0.8.22, negative 0.062, 0.448, 0.878, negative 0.372, 0.028. Third column labeled (x subscript i minus x-bar) quantity squared with entries 0.575, 0.551, 1.016, 1.259, 0.676, 0.004, 0.201, 0.771, 0.138, 0.001.
The average January surface water temperatures (°C) of Lake Michigan from 2000 to 2009 were 5.07, 3.57, 5.32, 3.19, 3.49, 4.25, 4.76, 5.19, 3.94, and 4.34.
The mean value of these temperatures is 4.312.
What is the variance of this data set?
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