What is the standard deviation of a normal distribution whose mean is 122 if a score of 170 corresponds to a z-score of 1.9?
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Originally Posted by khalyar What is the standard deviation of a normal distribution whose mean is 122 if a score of 170 corresponds to a z-score of 1.9? z-score = $\dfrac{x-\mu}{\sigma}$ where $\mu$ is the mean, and $\sigma$ is the standard deviation $1.9 = \dfrac{170 - 122}{\sigma}$ solve for $\sigma$
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