Calculating the Mean of a Data Set

In this video, Mr. J explains how to find the mean of a data set, also known as the average. The mean is a measure of central tendency that provides a single value to represent a data set. The video includes two examples: one with a simple data set of five numbers and another with a more complex data set of eight numbers. Mr. J demonstrates how to calculate the mean by adding all the numbers in the data set and dividing by the total number of numbers. The video concludes with a summary of the process and a thank you to viewers.

What is another common term for 'mean' in statistics?

• Median

• Mode

• Range

• Average

What does the mean represent in a data set?

• The middle value

• The most frequent value

• The difference between highest and lowest values

• A central value that describes the set

Which of the following is a measure of central tendency?

• Difference

• Sum

• Range

• Mean

What does the mean of a data set help to determine?

• The variability of the data

• The difference between the highest and lowest values

• A typical value that represents the data set

• The total sum of all data points

How do you calculate the mean of a data set?

• Find the number that appears most frequently

• Add the smallest and largest numbers and divide by two

• Multiply all numbers and take the square root

• Divide the sum of all numbers by the total number of values

In the first example, what is the mean of the data set 2, 4, 4, 5, 5?

• 4

• 5

• 20

• 10

What is the total number of data points in the first example?

• 10

• 6

• 4

• 5

In the second example, what is the mean of the data set 58, 58, 61, 68, 72, 73, 77, 81?

• 70

• 75

• 68.5

• 65

How many data points are there in the second example?

• 8

• 7

• 9

• 10

What is the sum of the numbers in the second example before dividing to find the mean?

• 548

• 500

• 600

• 450