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Math Help - Standard Deviation Help

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    Exclamation Standard Deviation Help

    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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    Re: Standard Deviation Help

    Quote Originally Posted by khalyar View Post
    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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