Central Tendency

Which is a synonym for "average?"

• mean

• median

• mode

• range

Which is the MIDDLE of an ordered set of data?

• Mean

• Median

• Mode

• Range

What do you do if there are two numbers in "the middle" when you are finding the median?

• Pick your favorite number
• Add the two numbers in the middle & then divide by two.
• They are both the median
• None of the above

What is an outlier?

• A value that is much less or much greater than the other values in a data set.
• The difference between the upper and lower quartiles of a data set.
• The mean of the distances from each data value in a set to the mean of a set.
• The difference between the greatest and least numbers in a data set.

At Donald's Donuts the number of donut holes in a bag can vary. Help Donald find the mode:
12, 10, 10, 10, 13, 12, 11, 13, 10

• 13
• 12
• 11
• 10

Find the median of these numbers:
4, 2, 7, 5, 3, 5

• 4
• 5
• 4.5
• 6

What is the range of the set: 49, 68, 62, 47, 39, 54, 43

• 25
• 29
• 31
• 19

Austin hit some home runs in a game.  He hit 9, 11, 12, and 8.  He wants his mean to be 10.  How many will he need in the next game?

• 40
• 50
• 10
• 3

What measure of central tendency (mean, median or mode) would be best for the following set of data?
0, 89, 92, 97, 99, 100

• Mode, because it is the one that shows up the most.
• Median, because there is an outlier.  The outlier could be incorrect and would influence the mean too much.
• Mean, because there is not an outlier.  You should always use the mean.
• There is not a best measure of central tendency for this data.

The number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below: 
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?

• 5
• 6
• 9
• 11