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What is the z score for scores in the bottom 10%? What is the z score...

What is the z score for scores in the bottom 10%?

What is the z score for scores in the top 2.5%?

please show each step, previous questions show 2.5% is 1.96 but I have no clue how they go from .025 to 1.96

Math   Statistics-And-Probability   
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