# Chapter 11 Data Analysis and Statistics - 11.1 Find Measures of Central Tendency and Dispersion - 11.1 Exercises - Problem Solving - Page 749: 31b

See below.

#### Work Step by Step

$(a-b)^2\geq0\\a^2+b^2-2ab\geq0\\a^2+b^2+2ab\geq4ab\\(a+b)^2\geq4ab$ Thus we proved what we had to.

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