Normal distribution coverage
68-95-99.7
Lets you estimate reference ranges and outliers quickly from a mean and SD.
Applies only to a normal distribution; skewed data do not follow these proportions.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.
68-95-99.7. It helps you recall: Normal distribution coverage.
Percent within 1 standard deviation of the mean
Percent within 2 standard deviations
Percent within 3 standard deviations
68: Percent within 1 standard deviation of the mean; 95: Percent within 2 standard deviations; 99.7: Percent within 3 standard deviations.
It belongs to Biostatistics in PSM.
Applies only to a normal distribution; skewed data do not follow these proportions.
Lets you estimate reference ranges and outliers quickly from a mean and SD.
Say it aloud, write it from memory tomorrow, then again in a week. Then test yourself on a PSM question about Biostatistics.
It is a teaching aid written or adapted by our team. Some resemble ones students share informally. Check any fact that matters in a standard source.