Mean, median, mode, range review

Front

What is the mean of a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the numbers together and dividing by the count of numbers.

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How do you find the median of a data set?

Back

To find the median, arrange the numbers in ascending order and identify the middle number. If there is an even number of values, the median is the average of the two middle numbers.

Front

What is the mode of a data set?

Back

The mode is the number that appears most frequently in a data set. A set may have one mode, more than one mode, or no mode at all.

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How do you calculate the range of a data set?

Back

The range is calculated by subtracting the smallest number in the set from the largest number.

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What is an outlier in a data set?

Back

An outlier is a value that is significantly higher or lower than the other values in a data set, which can skew the results.

Front

If the mean of a data set is 18, what does that imply?

Back

It implies that the sum of all values divided by the number of values equals 18.

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What happens if there are no repeating numbers in a data set?

Back

If there are no repeating numbers, the mode does not exist.

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How do you find a missing number in a data set if the mean is known?

Back

To find a missing number, multiply the mean by the total number of values, then subtract the sum of the known values.

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What is the significance of the median in a data set?

Back

The median provides a measure of central tendency that is less affected by outliers than the mean.

Front

How can you determine if a number is an outlier?

Back

A common method is to calculate the interquartile range (IQR) and identify values that fall below Q1 - 1.5*IQR or above Q3 + 1.5*IQR.