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A normal distribution has a mean of µ = 28 with σ = 5. What is the minimum raw score needed to be in the top 25% of the distribution?

  • stats -

    Use z-scores.

    Determine the z-value using a z-table for the top 25%. Substitute the z into the formula, along with the mean and standard deviation. Solve for x.

    Formula:
    z = (x - mean)/sd

    I hope this will help get you started.

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