Measures of Center and Variability

Front

What is a Measure of Center?

Back

A Measure of Center is a statistical value that represents the center point or typical value of a dataset. Common measures include mean, median, and mode.

Front

What is the mean?

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.

Front

What is the median?

Back

The median is the middle value in a dataset when the numbers are arranged in order. If there is an even number of values, the median is the average of the two middle numbers.

Front

What is the mode?

Back

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

Front

What is the range of a dataset?

Back

The range is the difference between the highest and lowest values in a dataset.

Front

Which of the following is NOT a Measure of Center: mean, median, mode, or range?

Back

Range is NOT a Measure of Center.

Front

How do you calculate the mean of the data set: 10, 20, 30?

Back

Add the numbers (10 + 20 + 30 = 60) and divide by the count of numbers (3). Mean = 60 / 3 = 20.

Front

What is the lower extreme of the data set: 19, 17, 13, 25, 23?

Back

The lower extreme is 13, which is the smallest number in the dataset.

Front

If the data set is 100, 42, 120, 42, 30, what is the range?

Back

Range = highest value (120) - lowest value (30) = 120 - 30 = 90.

Front

What does it mean if a dataset has no mode?

Back

It means that no number appears more than once in the dataset.