The weighted average cost per unit is therefore $257.78 ($116,000 ÷ 450 units.). When using the weighted average method, divide the cost of goods available for sale by the number of units available for sale, which yields the weighted-average cost per unit.
The weighted average would return $0.28, a more accurate representation of the average cost of a case of widgets in these two shipments. A shipment of 10 cases of widgets costs $0.20 per case. Consider the following example: The average cost of the cases in each shipment -- determined by the formula ($0.20+$0.30)/2 = $0.25 -- is not an accurate measure of the average cost of the cases because it does not take into account that there are 30 more cases being purchased at $0.30 than at $0.20. When using the weighted average method, divide the cost of goods available for sale by the number of units available for sale, which yields the weighted-average cost per unit. In this calculation, the cost of goods available for sale is the sum of beginning inventory and net purchases. The total of all purchased or beginning inventory units is 450 (150 beginning inventory + 300 purchased). The weighted average cost per unit is therefore $257.78 ($116,000 ÷ 450 units.). The ending inventory valuation is $45,112 (175 units × $257.78 weighted average cost), while the cost of goods sold valuation is $70,890 (275 units × $257.78 weighted average cost). The sum of these two amounts (less a rounding error) equals the $116,000 total actual cost of all purchases and beginning inventory The student has earned the following scores for each category: tests-83, final exam-75, quizzes-90, homework-100. We need to calculate the student's overall grade. To calculate a weighted average with percentages, each category value must first be multiplied by its percentage. Then all of these new values must be added together. In this example, we must multiply the student's average on all tests (83) by the % that the tests are worth toward the final grade (40%). Examples: Weighted Average with Percentages. Example 1: A student is enrolled in a biology course where the final grade is determined based on the following categories: tests 40%, final exam 25%, quizzes 25%, and homework 10%. 1 Solve for x. 2  You would need an 80 percent on the test to get an 80 percent in the class. 3  Weighted average is not the same as the mean. 4  If you took the mean of 90, 75 and 87 percent scores, you would arrive at an answer of 84 percent, an incorrect answer when weights of 25, 50 and 25 percent are to be factored in. 1 Weighted average is not the same as the mean. 2  If you took the mean of 90, 75 and 87 percent scores, you would arrive at an answer of 84 percent, an incorrect answer when weights of 25, 50 and 25 percent are to be factored in. 3  The answer should be 81.75 percent. It is helpful to separate the purchases from the sales. Goods available for sale is 415 units with a total cost of $3,394.00. If we divide $3,394.00 by 415, we get a weighted average cost of $8.18 (rounded) per unit. The rest of the calculation is very simple at this point. The company sold 245 units. We will use $8.18 as the cost of each unit, therefore the total cost of goods sold is $2.004.10. What if we had 20 units at $100 and 10 units at $500. You might notice that the ratio of $100 units to $500 units is still the same (2:1). Let’s do the calculation to confirm that the weighted average will be the same. The total cost of all the units is $7,000 and there are 30 units. Weighted average calculation. The weighted average (x) is equal to the sum of the product of the weight (w i) times the data number (x i) divided by the sum of the weights: Find the weighted average of class grades (with equal weight) 70,70,80,80,80,90: Since the weight of all grades are equal, we can calculate these grades with simple average or we can cound how many times each grade apear and use weighted average. 2×70,3×80,1×90. x = (2×70+3×80+1×90) / (2+3+1) = 470 / 6 = 78.33333. 1 You would need an 80 percent on the test to get an 80 percent in the class. 2  Weighted average is not the same as the mean. 3  If you took the mean of 90, 75 and 87 percent scores, you would arrive at an answer of 84 percent, an incorrect answer when weights of 25, 50 and 25 percent are to be factored in. 1 Weighted average is not the same as the mean. 2  If you took the mean of 90, 75 and 87 percent scores, you would arrive at an answer of 84 percent, an incorrect answer when weights of 25, 50 and 25 percent are to be factored in. 3  The answer should be 81.75 percent.
https://support.microsoft.com/en-us/kb/214049 http://www.accountingtools.com/weighted-average-method http://study.com/academy/lesson/calculating-weighted-average-method-formula-example.html http://www.wikihow.com/Calculate-Weighted-Average http://accountinginfocus.com/financial-accounting/inventory/weighted-average-inventory/ http://www.rapidtables.com/calc/math/weighted-average-calculator.htm http://www.wikihow.com/Calculate-Weighted-Average
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