EXAMPLE 3 Find the mean TEMPERATURE

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Presentation transcript:

EXAMPLE 3 Find the mean TEMPERATURE The table gives the daily minimum temperatures (in degrees Fahrenheit) in Barrow, Alaska, for the first 5 days of February 2004. Find the mean daily minimum temperature.

EXAMPLE 3 Find the mean SOLUTION To find the mean daily minimum temperature, find the sum of the minimum temperatures for the 5 days and then divide the sum by 5. = –21 + (–29) + (–39) + (–39) + (–22) 5 Mean 150 5 – = = – 30 The mean daily minimum temperature was –30°F. ANSWER

Simplify an expression EXAMPLE 4 Simplify an expression Simplify the expression 36x 24 6 – . 36x 24 6 – = 36x 24 – 6 ( ) Rewrite fraction as division. = 36x 24 – 1 6 ) ( Division rule = 36x 1 6 – 24 Distributive property 6x – 4 = Simplify.

9. Find the mean of the numbers –3, 4, 2.8, and –1.5 . GUIDED PRACTICE for Examples 3 and 4 9. Find the mean of the numbers –3, 4, 2.8, and –1.5 . The mean is 0.575. ANSWER Temperature 10. Find the mean daily maximum temperature (in degrees Fahrenheit) in Barrow, Alaska, for the first 5 days of February 2004. Day in February 1 2 3 4 5 Minimum temperature (°F) – 3 – 20 – 21 – 22 – 18

GUIDED PRACTICE for Examples 3 and 4 The mean daily minimum temperature was –16.8°F. ANSWER

GUIDED PRACTICE for Examples 3 and 4 Simplify the expression 2x – 8 –4 11. – x = 1 2 + 2 –6y +18 3 12. = –2y + 6 –10z – 20 –5 13. = 2z + 4