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I'm afraid you'd have to tell me what 'psa' means. I don't think a human malewith a Prostate Specific Antigen concentration of 274 could be walking around.
321.8
it means that the score is above the mean
Yes.z = (raw score - mean)/standard error.Since the standard error is positive, z < 0 => (raw score - mean) < 0 => raw score < mean.
20% of 295 = 20% * 295 = 0.2 * 295 = 59