Solve each formula for the specified variable. Assume that the denominator is not 0 if variables appear in the denominator. z = (x-μ)/σ, for x (standardized value)

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Start with the given formula: \(z = \frac{x - \mu}{\sigma}\).

To solve for \(x\), multiply both sides of the equation by \(\sigma\) to eliminate the denominator: \(z \times \sigma = x - \mu\).

Next, isolate \(x\) by adding \(\mu\) to both sides: \(x = z \times \sigma + \mu\).

This expression now represents \(x\) in terms of \(z\), \(\mu\), and \(\sigma\).

Remember that \(\sigma\) (standard deviation) is assumed to be nonzero to avoid division by zero.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Solving Formulas for a Specific Variable

This involves rearranging an equation to isolate the desired variable on one side. It requires applying inverse operations such as addition, subtraction, multiplication, division, and sometimes more advanced algebraic techniques to rewrite the formula clearly in terms of the specified variable.

Understanding the Standardization Formula

The formula z = (x - μ) / σ represents the standard score or z-score, which measures how many standard deviations a data point x is from the mean μ. Recognizing the roles of each variable helps in correctly manipulating the formula to solve for x.

Handling Variables in the Denominator

When variables appear in the denominator, it is important to assume they are nonzero to avoid undefined expressions. This assumption allows safe multiplication across the equation to eliminate fractions and solve for the desired variable without division by zero errors.