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    Normal Probabilities - Using Z Score

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    A normal distribution has a mean of u= 40 and o=10. if a vertical line is drawn through the distribution at x= 55, what proportion of the scores on the right side of the line?

    A normal distribution has a u= 80 and o= 10. what is the probability of randomly selecting a score greater than 90 from this distribution?

    A normal distribution has a mean of u= 100 and o= 20. if one score is randomly selected from the probability that the score will be less than x= 84?

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    Solution Preview

    A normal distribution has a mean of u= 40 and o=10. If a vertical line is drawn through the distribution at x= 55, what proportion of the scores on the right side of the line?
    Answer
    We need P (X > 55)
    P (X > 55) = = P (Z > 1.5) ...

    Solution Summary

    The solution provides step by step method for the calculation of probability using the Z score. The normally distribution has mean of u=100 and o=20. The expert determines if the probability of randomly selecting a score is greater than 90 from the distribution. The expert also determines if one score is randomly selected from the probability that the score will be less than x=84.

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