Chemistry/Normal Distributions/Math

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I'm confused on how to calculate the standard deviation for this...

The 95% confidence limit for calcium in control sera is reported as 9.2-10.2 mg/dl. Calculate the value for one standard deviation and the coefficient of variation for this data.

  • Chemistry/Normal Distributions/Math -

    I might have figured it out and it was easier than I though it was if I'm correct.

    Does this look right?....

    Lower Limit = mean - 2SD
    and
    Lower Limit = 9.2 mg/dl

    9.2 = ((9.2+10.2)/2) - 2SD
    2SD = 0.5
    SD = 0.25??

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