Homework Help: stats

Posted by Komal on Tuesday, October 23, 2012 at 4:23pm.

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

stats - MathGuru, Tuesday, October 23, 2012 at 6:29pm
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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