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    Probability problems

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    We are using a chart on standard normal (z) distribution: cumulative area from the LEFT showing Negative x Scores on one side and Positive (z) scores on the other.

    a. P(z>2.61).

    b. P(-1.62 < z < 2.81).

    c. The z-score that would create a right tail of 31%.

    d. The z-score that would create a left tail of 6.5%.

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    Solution Summary

    This solution gives the step by step method for computing probabilities based on Z score (see attachment for figures).