High School Level Questions on Statistical Measures
from the Dr. Math Archives

High School Dr. Math Questions on Measurement
Below are some questions and answers from our archive of questions sent via e-mail by K12 students and teachers to Ask Dr. Math. You may also browse the entire high school level archive by category.

 Statistical Measures

   Measures of Center

Median and Middle
I would like to know how to find the median of two of the same numbers (2 and 2).

   Measures of Spread

IQ Tests and Standard Deviation
On standard IQ tests, the mean is 100, with a standard deviation of 15. Find the percent of people whose IQ scores are greater than 115...
Measures of Dispersion
What are the different characteristics of: Range, Mean Absolute Deviation, Standard Deviation, Variance, Quantiles (percentile, decile, quartiles), covariance?
Standard Deviation Formula
What is the formula for calculating the standard deviation?
Standard Deviation Questions
Why does a standard deviation take the square root of the average of the sum of the squared differences between X and X mean instead of the average of the absolute value differences? What is the reasoning behind dividing by n vs. n-1 in the population versus sample standard deviations?
Variance Question: 20 Golf Players
How do you set up four teams such that the variance in the average team handicap is no more than one or two?
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Mara Landers

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