## Numerical Measures of Central Tendency and Variability

Read these sections and complete the questions at the end of each section. First, we will define central tendency and introduce mean, median, and mode. We will then elaborate on median and mean and discusses their strengths and weaknesses in measuring central tendency. Finally, we'll address variability, range, interquartile range, variance, and the standard deviation.

### Measures of Central Tendency

#### Questions

Question 1 out of 5.
What is the mean of 2, 4, 6, and 8?

________

Question 2 out of 5.
What is the median of -2, 4, 0, 3, and 8?

________

Question 3 out of 5.
What is the mode of -2, 4, 0, 3, 0, 2, 4, 4, and 8?

________

Question 4 out of 5.
Tom's test scores on his six tests are 95, 80, 75, 97, 75, 88. Which measure of central tendency would be the highest?

________

Question 5 out of 5.

Jane's test scores on her five tests are 90, 87, 70, 97, and 75. Her teacher is going to take the median of the test grades to calculate her final grade. Jane thinks she can argue and get two points back on some of the tests. Which test score(s) should she argue?

• 90
• 87
• 70
• 97
• 75
• As many as she can