A weighted average is a more accurate measurement of scores or investments that are of relative importance to each other. This is often the case with investment portfolios, grade scoring and other statistics.You can find out how to calculate weighted averages.ultiply each number by its weight. 1  You can choose to write this at the end of the chart or to do it on 1 line, in a formula. 2  For example, if you are trying to figure out the weighted average of certain grades, you might write 0.9(0.25) to indicate a 90 percent grade times 25 percent of the total grade.
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1 The Biggest Part: the Cerebrum. 2  The Cerebellum's Balancing Act. 3  Brain Stem Keeps You Breathing â and More. 4  Pituitary Gland Controls Growth. 5  Hypothalamus Controls Temperature. 6  You Have Some Nerve! 7  Emotion Location. 8  Be Good to Your Brain. So what can you do for your brain? Plenty. Eat healthy foods. They contain potassium and calcium, two minerals that are important for the nervous system. Get a lot of playtime (exercise). Wear a helmet when you ride your bike or play other sports that require head protection. Don't drink alcohol, take drugs, or use tobacco.