Measures of Center Spread

• 136
• 150
• 156
• 153

The number of text messages that Isaac received each day for a week is shown: 47, 49, 54, 50, 48, 47, 55
What is the mean and median

• Mean=49
  Median=54
• Mean=49 
  Median=50
• Mean=50 
  Median=54
• Mean=50
  Median=49

The numbers of runs scored by a softball team in 20 games are given.
 3, 4, 8, 12, 7, 5, 4, 12, 3, 9, 11, 4, 14, 8, 2, 10, 3, 10, 9, 7
What is the Interquartile Range.

• IQR = 6
• IQR = 10
• IQR = 7.5
• IQR = 12

The range is the difference between the greatest and the least data values.

• True
• False

Quartiles are values that divide a data set into four equal parts.

• True
• False

1-  The first quartile (Q 1) is the median of the lower half of the set.
2-  The second quartile (Q 2) is the median of the whole set .
3-  The third quartile (Q 3) is the median of the upper half of the set.

• All three statements are true.
• Only the 1st statement is true.
• Only the 2nd and the 3rd statements are true.
• Only the 3rd statement is true.

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

Given the data: 21, 31, 26, 24, 28, 26
This is a 3 part question:
Part-1: What is the mean of the data?

• 24
• 25
• 26
• 27

Given the data: 136, 150, 119, 150, 125, 143.
Find the range. 

• Range = 136 - 125 = 21.
• Range = 150 - 125 = 75.
• Range = 150 - 125 = 25.
• Range = 150 - 119 = 31

Given the data: 136, 150, 119, 150, 125, 143.
Find the interquartile range (IQR)

•  IQR = 150 - 119 = 31
•  IQR = 150 - 125 = 25.
• IQR = 150 - 125 = 75.
•  IQR = 150 - 119 = 31.