Measures of Variability Q4

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

• 4.1
• 6
• 4.5
• 4

The data set below has an outlier of 42.
2, 5, 12, 15, 19, 4, 6, 11, 16, 18, 12, 12, 42
What effect does removing the outlier have on the distribution of the data?

• The mean will decrease
• The median will decrease
• The mean will increase
• The median will increase

Which measure of center best represents this set of data?
12, 13, 11, 16, 31, 14, 10, 15

• Mean
• median
• mode

What measure of center is best to use when we have outliers?

• mean

• median

• mode

• range

11. What percentage of the data is between 90 and 140?

• 25 %
• 50%
• 75%
• 100%

What is the interquartile range (IQR)?

• 4
• 64
• 60
• 8

The Table above shows the points scored by the JV basketball team in their first seven games. Calculate the mean, median, mode and range. Which statistical measure makes the team sound the best?

• Mean
• Median
• Mode
• Range

The interquartile range (IQR) of a data set is the difference between the third and first quartiles. It represents the range of the middle half of the data.

• True
• False

Paulo got these grades in three tests: 72, 80 and 82. He had one more test to take. He wanted an average of 80 for the four tests. What mark must he get in the fourth test?

• 80
• 234
• It is not possible for him to get an 80 average
• 86

Ms. Rork's class had a range of test grades from 78 to 97. She forgot to add in a student who got an 80% on the test. How will this affect the range?

• Increase
• Decrease
• Stay the Same