What is the z-score for 80%

Confidence Levelz* Value80%1.2885%1.4490%1.6495%1.96

How do you find the 75th percentile of a normal distribution?

You would need to be 0.674 standard deviations to the right of the mean to be at the 75th percentile. Referring the normal table, we get Z’=0.675. This means 0.675 times SD away from the mean is 75th percentile.

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