Homework Help: statistics

Posted by Robbie on Wednesday, November 7, 2012 at 8:48pm.

A normal distribution has a mean of 100 and standard deviation of 20. What is the
probability of randomly selecting a score less than 130 from this distribution?
a, p=0.9032
b, p=0.9332
c, p=0.0968
d, p=0.0668

statistics - PsyDAG, Thursday, November 8, 2012 at 10:53am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

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