Eight Practice Problems -- Normal Distribution
9. On a standardized test, scores are normally distributed with a mean of 400 and a standard deviation of 80. What score must one have to be in the 80th percentile? The blue italic number indicates the one computed by one of the four formulas. z x μ σ Answer. 1. 0.642857 8 7.1 1.4 0.739842. 2. ................
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