1. Example 2 One of the coldest places on Earth is a Russian town located near the Arctic Circle. To the nearest degree, what is the mean of the average high temperatures shown in the table for winter in the Russian town? Winter Temperatures MonthDecJanFebMar Average high 147°F – 48°F – 43°F – 37°F – 41°F – 40°F – 48°F – 18°F – Multiple Choice Practice

2. Example 2 SOLUTION STEP 1 Find the sum of the temperatures. + () 40 – +41 – + () 48 – () 18 – = 147 – STEP 2 Divide the sum by the number of temperatures. 4 147 – = 36.75 – To the nearest degree, the mean of the temperatures is 37°F. – ANSWER The correct answer is D. Multiple Choice Practice

3. Example 3 Evaluating an Expression c abab 24 –() 8 4 – = Substitute values. 192 – 4 – = Multiply. 48 = Divide. Same sign, so quotient is positive. Evaluate the expression when, and. c ab a = 24, – c = 4 – b = 8

4. Guided Practice Find the mean of the data. for Examples 2 and 3 ANSWER 9 – 2 9. 16, – 17, 23, – 31 – 8,8, ANSWER 3 – 10. 4,4, – 4,4, 10, – 0,0, 11, 9,9, – 13 – Evaluate when bc a a = 42, – b = 3, and – 11. c = 7.7.