Data and Statistics - The MEAN

Data and Statistics

The MEAN​

by Mr. Crofts

​What is the MEAN?

​Quick Facts about the MEAN

​1. The MEAN summarises an entire data set into a single value.

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2.​ The MEAN is also known as the Average.

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3. The MEAN is found by adding all values together, and then dividing by the total number of values.​

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4. The MEAN is best used for NUMERICAL DATA, but can be used for Categorical Data as well.​

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5. The MEAN can be affected by outliers.​

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Multiple Choice

Determine the MEAN of the following data set.

{10, 11, 7, 8, 11, 10, 12, 7, 5}

• 10

• 9

• 8

• 11

Multiple Choice

Determine the MEAN of the following data set.

{90, 75, 60, 80, 85, 95, 80, 75}

• 90

• 75

• 80

• 85

Multiple Choice

Determine the MEAN number of hours Bernie has worked each day for the week.

• 9.0 Hours

• 8.4 Hours

• 8.8 Hours

• 7.9 Hours

Multiple Choice

Determine Frederica's MEAN dancing score.

(HINT: remember that frequency tells us how many time a values occurs/appears)

• 9

• 8.8

• 9.2

• 8.2

Multiple Choice

A football team plays 8 matches which leaves them with an average score of 67.5. If they play two more games where they score 89 and then 100, what does their average change to?

• 72.9

• 85.5

• 94.5

• 91.1