Asked by chelsea

A particular normal distribution has mean of 575 and standard deviation of 150.
What X values form the boundaries for the middle 60% of the data? Round answers to two decimal places.

Lower boundary: Blank 1
Upper Boundary: Blank 2
Answered by PsyDAG
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.30 from mean) and get the Z scores.

Insert Z scores into equation below.

Z = (score-mean)/SD
Answered by t
12
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