Asked by tammy
For a normal distribution with a mean of 140 and a standard deviation of 55 find each value requested.
a. What is the minimum score needed to be in the bottom 10% of the distribution?
b. What scores form the boundaries for the middle 75% of the distribution.
a. What is the minimum score needed to be in the bottom 10% of the distribution?
b. What scores form the boundaries for the middle 75% of the distribution.
Answers
Answered by
PsyDAG
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.10) related to the Z score. Insert values to find score.
Middle 75% = ± .375 between score and mean. Use the same table.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.10) related to the Z score. Insert values to find score.
Middle 75% = ± .375 between score and mean. Use the same table.
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