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    Calculating Probabilities without Standard Deviation

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    I need some guidance in how to calculate probabilities without knowing the std deviation.

    Population = 3005

    calculate P(x-bar > 50.8) for sample size of n = 253

    calculate P(x-bar > 50.6) for sample size of n = 134

    calculate P(x-bar > 51) for sample size of n = 119

    Then combine the two probabilities 51 and 50.6 into one using the concept of independent events.

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    Solution Preview

    Please see the attached file.

    I need some guidance in how to calculate probabilities without knowing the std dev. I am struggling with the correct formula...

    Population = 3005

    (1) calculate P(x-bar > 50.8) for sample size of n = 253

    (2) calculate P(x-bar > 50.6) for sample size of n = 134

    (3) calculate P(x-bar > 51) for sample size of n = 119

    Then combine the two probablities 51 and 50.6 into one using the concept of independent events.

    Guidance would be appreciated.

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    Hi, regarding your questions, I would like to give you the following guidance.

    First of all, since you did not provide any detailed information for each of samples (with size n=253, 134, and 119, respectively), I could not provide with you a ...

    Solution Summary

    The solution calculates probabilities without standard deviation.

    $2.19

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