Asked by Anonymous

A set of data is normally distributed with a mean of 455 and a standard deviation of 25. What percent of the data is in the interval 405–455?

Answers

Answered by PsyDAG
One is the mean.

Z = (score-mean)/SD


Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score. Multiply by 100.
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