Homework Help: Math

Posted by Ally on Sunday, April 25, 2010 at 8:56pm.

For a normally distributed distribution of variable x, where the mean is 50, and standard deviation is 2.5, calculate: a) the percentile rank of x=45 b) the z-score of x=52.6 c) the percentile rank of x=58 d) the 29.12th percentile e) the 89.74th percentile f) the z-score of x=45 g) the percentile rank of x=49

Math - PsyDAG, Monday, April 26, 2010 at 11:11am
Z = (x - μ)/SD, where μ = mean.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the percentile ranks relates to the Z scores.

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