Unit 2: Statistics Review

To find the _________ you add up all the numbers and then divide by how many numbers you have.

• Mean
• Median
• Mode
• Range

Find the mean of the numbers below:

4, 9, 7, 10, 5

• 5

• 6

• 7

• 8

True or False - Before finding the median, you need to order the data from least to greatest.

• True

• False

Find the median.
12, 5, 9, 18, 22, 25, 5

• 9
• 8
• 12
• 18

Dr. Dre is a dentist. He needs to report on the average number of cavities that his patients have.
1,0,1,5,6,3,4

• 3.33
• 2.85
• 3
• 3.5

Lizzy had test scores of:   72, 94, 108, 60
What is the RANGE of her test scores?

• 12
• 72
• 48
• 98

Hopefully you answered
"z-score".
 A z-score tells us how many standard deviations a score is from the mean.
What is another word for "mean"?

• nasty
• average
• median
• good looking

Adam's Z-score on a test is +2.5.  What does this mean?

• He'd better start studying.
• He did better than EVERYONE.
• He scored 2.5 standard deviations above the average.
• He did terrible.

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Joanne's Z-score is -1.5.  What does this mean?

• She didn't take the test yet.
• She scored 1.5 standard deviations below the average.
• She did better than most people.
• No clue