Range & Interquartile Range/box Plots

What is the first step to take when attempting to find IQR?

• Find the lower and upper quartile.

• Find the median.

• Put the list of numbers in order.

• Subtract the lower and upper quartile.

Find the median, first quartile, third quartile, and interquartile range of the data.

32, 53, 72, 66, 47, 54, 49, 67, 71

• Median: 54

  First Quartile: 49

  Third Quartile: 67

  IQR: 18

• Median: 54

  First Quartile: 48

  Third Quartile: 69

  IQR: 21

• Median: 54

  First Quartile: 48

  Third Quartile: 69

  IQR: 22

• Median: 54

  First Quartile: 49

  Third Quartile: 69

  IQR: 20

Karen constructed the box-and-whisker plot below to show information about her first semester scores.

What was Karen's median test score?

• 70

• 85

• 90

• 95

The list below shows the most recent test scores for students in Mr. Garcia’s study group.

78, 90, 94, 72, 80, 68, 72, 88, 94, 98, 86, 96

Which box-and-whisker plot correctly represents the data in the list?

• 
• 
• 
• 

What is the minimum value?

• 64
• 58
• 66
• 60

What data value is the upper quartile (Q3)?

• 64
• 62
• 66
• 58

What is the interquartile range (IQR)?

• 4
• 64
• 60
• 8

Find the mode:
5, 0, 9, 9, 3, 0, 5, 5, 4

• 9
• 5
• 3
• 7

What is the definition of the range?

• The average
• The number that occurs the most
• The middle number
• The difference of the largest and smallest numbers

What is the definition of the mean?

• The average
• The middle number
• The difference between the highest and lowest numbers
• The number that occurs the most