Review: Mean, Median, Mode, Range, IQR, Box Plots

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 data set 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 number that appears most frequently in a data set.

Front

What is the range?

Back

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

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the middle 50% of the data.

Front

How do you find the first quartile (Q1)?

Back

To find Q1, arrange the data in ascending order and find the median of the lower half of the data set.

Front

How do you find the third quartile (Q3)?

Back

To find Q3, arrange the data in ascending order and find the median of the upper half of the data set.

Front

What is a box plot?

Back

A box plot is a graphical representation of a data set that shows the minimum, first quartile (Q1), median, third quartile (Q3), and maximum.

Front

How do you calculate the mean of the following numbers: 72, 50, 54, 66, 58, 79, 54, 99, 40, 68?

Back

Mean = (72 + 50 + 54 + 66 + 58 + 79 + 54 + 99 + 40 + 68) / 10 = 59.

Front

What is the median of the following data set: 9, 9, 11, 17, 8, 9, 16, 8, 6, 17?

Back

First, arrange the data: 6, 8, 8, 9, 9, 9, 11, 16, 17, 17. The median is 9.