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## Summary of Range, variance, and standard deviation

Range, variance, and standard deviation

The range is the difference between the highest and lowest values in the data set. Variance describes the distribution of data. Standard deviation is the square root of variance and it measures the spread of data around the mean. Z score is used to estimate the number of standard deviations between any value and the mean. Coefficient of variation is a different method for estimating the spread of data around the mean and can be used to compare studies that are using different units of measurements.

## Flashcards on Range, variance, and standard deviation

### Range, variance, and standard deviation

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Leptokurtic curves have (increased/decreased) standard deviation.

## Questions on Range, variance, and standard deviation

### Range, variance, and standard deviation

USMLE® Step 1 style questions

1 questions

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A research study of 100 patients shows that their calcium levels range from 8.8-15.1 mg/dL, with a mean of 12.1 mg/dL. The calcium levels fall in a normal distribution, with a standard deviation of 1.0 mg/dL. Based on this study, we know that the percentage of calcium values below 10.1 is approximately:

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