Saturday, November 3, 2012
Textbook: Chapter 2.2 Page 62 Question #27
27. The mean of six rational numbers is -4.3.
a) What is the sum of the rational numbers?
b) If five of the numbers each equal -4.5, what is the sixth number?
a) -4.3 x 6 = -25.8
b) You multiply -4.5 by 5 to get the sum of the first 5 numbers.
-4.5 x 5 = -22.5a
Then you subtract -22.5 from -25.8
-25.8 - (-22.5) = -3.3
So, the sixth number is -3.3
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