Flashcard Mean, Median and Mode

Front

What is the mean of a data set?

Back

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

Front

How do you calculate the mean of the data set {15, 28, 11, 23, 15, 29, 20, 26, 13}?

Back

Add all the numbers: 15 + 28 + 11 + 23 + 15 + 29 + 20 + 26 + 13 = 20. Then divide by the count of numbers (9): 20.

Front

What is the median of a data set?

Back

The median is the middle number in a sorted list of numbers. If there is an even number of observations, the median is the average of the two middle numbers.

Front

How do you find the median of the data set {15, 28, 11, 23, 15, 29, 20, 26, 13}?

Back

First, sort the data: {11, 13, 15, 15, 20, 23, 26, 28, 29}. The median is the middle number, which is 20.

Front

What is the mode of a data set?

Back

The mode is the number that appears most frequently in a data set.

Front

How do you find the mode of the data set {15, 28, 11, 23, 15, 29, 20, 26, 13}?

Back

The number 15 appears most frequently (twice), so the mode is 15.

Front

What is a dot plot?

Back

A dot plot is a simple way to display data using dots above a number line, where each dot represents one observation.

Front

How do you find the median from a dot plot?

Back

Count the total number of dots. If odd, the median is the middle dot. If even, average the two middle dots.

Front

What is a stem-and-leaf plot?

Back

A stem-and-leaf plot is a method of displaying quantitative data in a graphical format, similar to a histogram, to retain the original data values.

Front

How do you find the mean from a stem-and-leaf plot?

Back

Add all the values represented in the plot and divide by the total number of values.