For comparison of the PBE, 2 control groups of children whose ages and genders were convenient with study groups hospitalized between 2009 and 2010 were included in the study.
To calculate a weighted average: 1. Multiply each value by its weight. (Ans: 20, 16, 5, 40, 24, 14, 68, and 0). 2. Add up the products of value times weight to get the total value. (Ans: Sum=187). 3.
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