Pregunta
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During the summer, Rafael's Toy Shop collects data that implies a relationship between the weekly average temperature and the number of kites sold. Choose the correct equation for the least squares line. A. \( \mathrm{y}=0.248 \mathrm{x}-8.95 \) During a week with an average temperature of \( 64.1^{\circ} \mathrm{F} \), how many kites can Rafael expect to sell? \( 7 \mathrm{~T}^{\circ} \mathrm{kites} \) (Round to the nearest whole number as needed.) During a week in which Rafael sells 8 kites, what will be the approximate average temperature? \( \square^{\circ} \mathrm{F} \) ( F ) (Round to the nearest tenth as needed.)

Ask by Fowler Romero. in the United States
Feb 13,2025

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During a week with an average temperature of \(64.1^{\circ} \mathrm{F}\), Rafael can expect to sell approximately 7 kites. During a week in which Rafael sells 8 kites, the approximate average temperature is \(68.3^{\circ} \mathrm{F}\).

Solución

To find the number of kites Rafael can expect to sell during a week with an average temperature of \(64.1^{\circ} \mathrm{F}\), we need to substitute the given temperature into the equation of the least squares line and solve for the number of kites sold. Given equation: \(y = 0.248x - 8.95\) Substitute \(x = 64.1\) into the equation: \[y = 0.248(64.1) - 8.95\] Now, we can calculate the number of kites Rafael can expect to sell during a week with an average temperature of \(64.1^{\circ} \mathrm{F}\). Calculate the value by following steps: - step0: Calculate: \(0.248\times 64.1-8.95\) - step1: Multiply the numbers: \(15.8968-8.95\) - step2: Subtract the numbers: \(6.9468\) The number of kites Rafael can expect to sell during a week with an average temperature of \(64.1^{\circ} \mathrm{F}\) is approximately 6.95 kites. To find the approximate average temperature during a week in which Rafael sells 8 kites, we need to substitute the given number of kites into the equation of the least squares line and solve for the average temperature. Given equation: \(y = 0.248x - 8.95\) Substitute \(y = 8\) into the equation: \[8 = 0.248x - 8.95\] Now, we can solve for the average temperature. Solve the equation \(8 = 0.248x - 8.95\). Solve the equation by following steps: - step0: Solve for \(x\): \(8=0.248x-8.95\) - step1: Swap the sides: \(0.248x-8.95=8\) - step2: Move the constant to the right side: \(0.248x=8+8.95\) - step3: Add the numbers: \(0.248x=16.95\) - step4: Divide both sides: \(\frac{0.248x}{0.248}=\frac{16.95}{0.248}\) - step5: Divide the numbers: \(x=\frac{8475}{124}\) The approximate average temperature during a week in which Rafael sells 8 kites is \(x = \frac{8475}{124} \approx 68.3^{\circ} \mathrm{F}\).

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Bonus Knowledge

To find out how many kites Rafael can expect to sell at an average temperature of \( 64.1^\circ F \), we can plug this value into the least squares line equation. Substituting \( x = 64.1 \): \[ y = 0.248(64.1) - 8.95 \] Calculating that gives us: \[ y = 15.873 - 8.95 \approx 6.9 \] Rounding to the nearest whole number, Rafael can expect to sell **7 kites**. Now, to find the average temperature when 8 kites are sold, set \( y = 8 \) in the equation and solve for \( x \): \[ 8 = 0.248x - 8.95 \] Rearranging gives us: \[ 0.248x = 8 + 8.95 = 16.95 \] Now, divide both sides by \( 0.248 \): \[ x \approx \frac{16.95}{0.248} \approx 68.3 \] Thus, when Rafael sells 8 kites, the approximate average temperature will be **68.3°F**.

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