Question

In a normal distribution, what z-score value separates the lowest 10% of the scores from the rest of the distribution?

Answer 1

-1.28
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Answer 2

this was actually a study question so you look up the probability for 10% in the table -change to a decimal and find the closest probability in the table. The lowest is below and it is in the tail, so the z-score that corresponds to the closest number is .1003 therefore it is -1.28