Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.16) and its Z score. (Remember that this Z score will be negative, because the percentile rank of 16 is below the mean.) Insert values into equation below.
Z = (score-mean)/SD
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points, and are approximately normally distributed. What SAT I score within the population would have a percentile rank of approximately 16?
Im not sure how to do this...please help!!
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It doesn't show .16, it shows .15 as p-value of 0.4404 and z as 1.15....what do i do??
1 answer