We then divide the outcome of SUMPRODUCT by the SUM of the weights.Īnd this returns the Weighted Average of 80. The SUMPRODUCT function multiplies each Test’s score by its weight, and then, adds these resulting numbers. We’ll use the SUMPRODUCT and SUM functions to determine the Weighted Average. In this example, the Mid-term and Final exams have a greater weight than Tests 1 and 2. With a Weighted Average, one or more numbers is given a greater significance, or weight. The numbers are added together and then divided by the number of numbers, as in this example, which returns an unweighted average of 5. Usually when you calculate an average, all of the numbers are given equal significance. The formula works by dividing the total cost of the two orders by the total number of cases ordered.Ĭalculate the average of a group of numbers To get the correct average, use this formula to get the result (28 cents per shipment): The math doesn’t take into account that there are more cases being sold at 30 cents than at 20 cents. If you averaged the cost of each shipment this way (0.20+0.30)/2 = 0.25, the result isn’t accurate. But a second shipment of 40 cases costs 30 cents per case, because pencils are in high demand. Use the SUMPRODUCT and the SUM functions to find a Weighted Average, which depends on the weight applied to the values.įor example, a shipment of 10 cases of pencils is 20 cents per case. Usually when you calculate an average, all of the numbers are given equal significance the numbers are added together, and then, divided by the number of numbers.
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