For any normal distribution what zscore separates the highes

For any normal distribution, what z-score separates the highest 80% of the scores from the rest of the distribution?

z = 0.84

z = -0.84

z = 1.28

z = -1.28

Solution

The highest 80% would be above the lowest 20%.

The highest 80% is at the 20th percentile.

Looking up .20 on the standard normal table, this occurs at a z score of -0.84

answer: -0.84

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