Introduction to Data Analysis

Unit 12: Data Analysis

Lesson 1 - Mean

Vocabulary

• Mean - the sum of the data divided by the number of pieces of data

• Average - or mean, summarizes the data to a single number

Multiple Choice

The average is called the __________

• mean

• median

• mode

• range

Multiple Choice

To find the average of a set of numbers, add up all the items and divide by...

• 2
• The minimum
• The maximum
• The number of items

Summarizing Data

You can summarize data by determining the mean of a set in graphical displays such as pictographs and dot plots.

The mean describes the CENTER OF DATA distribution.

Distribution - shows the arrangement of data values

Calculating Mean

Multiple Choice

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1
• 6
• 4.5
• 4

Multiple Choice

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29
• 38
• 50
• 145

Multiple Choice

What is the mean of the data set below?
10, 15, 7, 8, 4, 5, 8, 3

• 60
• 7.5
• 7
• 8

Multiple Choice

Jonathan's last five test grades are 94, 91, 93, 87, and 90. What is the mean of Jonathon's grades? Fill your answer into the grid below.

• 455

• 91

• 227.5

• 93