The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.

## What is the difference between the highest and lowest scores in a distribution?

The range represents the difference between the highest and lowest score in a distribution. It is rarely used because it considers only the two extreme scores.

## Is mode the highest number?

This is a common result. You should not assume that your mean will be one of your original numbers. The mode is the number that is repeated more often than any other, so 13 is the mode. The largest value in the list is 21, and the smallest is 13, so the range is 21 – 13 = 8.

## Is the average of the greatest and least values in the data set?

from least to greatest or greatest to least; the median is the data value in the middle; if there is an even number of data values in the set, the median is the mean of the two middle values. no values occur more than others, there is no mode.

## Which set has the smallest range?

Summary: The range of a set of data is the difference between the highest and lowest values in the set. To find the range, first order the data from least to greatest. Then subtract the smallest value from the largest value in the set.

## Which measure of variability is considered most reliable?

The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.

## Which is reliable measure of variability?

Variance is the average squared difference of the values from the mean. Unlike the previous measures of variability, the variance includes all values in the calculation by comparing each value to the mean.

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