Find the z-score that separates a normal distribution into the following two portions. (a) separate the lowest 80% from the highest 20% (b) separate the lowest 90% from the highest 10% (c) separate the lowest 15% from the highest 85%

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A: standard normal distributionZ~N(0,1)note : area under standard normal curve represents probability.

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A: Actress (X) Actor (Y) D  =X -Y (D-Dbar)^2 25 60 -35 620.01 26 34 -8 4.41 29 40 -11 0.81 26…