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.
Fish deservedly has a reputation as a top-notch brain food. Itâs an outstanding source of protein which is needed to form mood-boosting neurotransmitters like serotonin and dopamine. Itâs also a great source of vitamin B12, an essential vitamin for a healthy brain and nervous system.
Physical Facts About the Brain. The adult human brain weights about 3 pounds and the cerebrum accounts for about 85% of the brain. The brain is composed of 40% gray and 60% white matter. The gray matter is made up of about 100 billion neurons that gather and transmit signals while the white matter is made of dendrites and axons that the neurons use to transmit signals. The brain is composted of about 75% water and is the fattiest organ in the body, consisting of a minimum of 60% fat. Humans have the largest brain to body ratio of any animal, and the blood vessels in the brain, if stretched end-to-end, would be about 100,000 miles long.