QuestionAugust 26, 2025

Calculate the weighted average of -15 and 12 with weights of (1)/(5) on the first number and (1)/(4) on the second number square

Calculate the weighted average of -15 and 12 with weights of (1)/(5) on the first number and (1)/(4) on the second number square
Calculate the weighted average of -15 and 12 with weights of (1)/(5) on
the first number and (1)/(4) on the second number
square

Solution
4.0(93 votes)

Answer

0 Explanation 1. Calculate the weighted sum Multiply each number by its weight and add them: (-15) \times \frac{1}{5} + 12 \times \frac{1}{4}. 2. Simplify the expression -3 + 3 = 0. 3. Calculate the total weight Add the weights: \frac{1}{5} + \frac{1}{4} = \frac{9}{20}. 4. Divide the weighted sum by the total weight \frac{0}{\frac{9}{20}} = 0.

Explanation

1. Calculate the weighted sum<br /> Multiply each number by its weight and add them: $(-15) \times \frac{1}{5} + 12 \times \frac{1}{4}$.<br /><br />2. Simplify the expression<br /> $-3 + 3 = 0$.<br /><br />3. Calculate the total weight<br /> Add the weights: $\frac{1}{5} + \frac{1}{4} = \frac{9}{20}$.<br /><br />4. Divide the weighted sum by the total weight<br /> $\frac{0}{\frac{9}{20}} = 0$.
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