Measures of Center and Variation

Front

What is the range of a data set?

Back

The range is the difference between the maximum and minimum values in a data set.

Front

How do you calculate the mean of a set of numbers?

Back

Add all the numbers together and divide by the total number of items.

Front

What is the median of a data set?

Back

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

Front

How do you find the median of the following set: 45, 69, 69, 87, 88, 92, 99, 100?

Back

The median is 87.5.

Front

What is the mode of a data set?

Back

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

Front

What is the formula for calculating the range?

Back

Range = Maximum value - Minimum value.

Front

If a data set has the numbers 12, 5, 9, 18, 22, 25, 5, what is the median?

Back

The median is 12.

Front

What does it mean if a data set has no mode?

Back

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

Front

What is the difference between mean and median?

Back

Mean is the average of all numbers, while median is the middle value when arranged in order.

Front

How do you find the mean of the numbers 12, 5, 9, 18, 22, 25, 5?

Back

The mean is (12 + 5 + 9 + 18 + 22 + 25 + 5) / 7 = 12.14.