Question: in a normal distribution, what z-score value separates the lowest 10% of the scores in the distribution? in other words, what z score cuts off

in a normal distribution, what z-score value separates the lowest 10% of the scores in the distribution? in other words, what z score cuts off the bottom 10% of the distribution from the upper 90% of the distribution?

a. z=1.28

b. z=3.08

c. z=-3.8

d. z= -1.28

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