Find quartiles and the interquartile range

Question 1

Find the lower quartile (Q1) of: 39, 16, 20, 26, 10, 20, 27, 29, 28, 25, 27

Answer 

Question 2

A box plot of reaction times (hundredths of a second) shows: minimum 15, Q1 23, median 31, Q3 39, maximum 53. About what percentage of the data is greater than 39?

Answer 

Question 3

Find the interquartile range (IQR) of: 15, 47, 39, 42, 42, 37, 60, 45, 56, 50

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Question 4

Find the lower quartile (Q1) of: 31, 38, 38, 41, 36, 6, 38

Answer 

Question 5

A box plot of reaction times (hundredths of a second) shows: minimum 10, Q1 18, median 23, Q3 30, maximum 33. What is the range?

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Question 6

Find the interquartile range (IQR) of: 13, 41, 10, 55, 33, 44, 34, 44

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Question 7

Find the lower quartile (Q1) of: 28, 50, 29, 13, 23, 15, 1, 39, 22, 30, 2

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Question 8

A box plot of reaction times (hundredths of a second) shows: minimum 14, Q1 17, median 26, Q3 35, maximum 46. What is the interquartile range?

Answer 

Question 9

Find the interquartile range (IQR) of: 13, 43, 15, 40, 14, 43, 12, 25

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Question 10

Find the lower quartile (Q1) of: 43, 21, 18, 20, 42, 43, 39

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Question 11

A box plot of reaction times (hundredths of a second) shows: minimum 6, Q1 8, median 15, Q3 24, maximum 28. What is the interquartile range?

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Question 12

Find the interquartile range (IQR) of: 15, 55, 43, 49, 28, 14, 13, 18

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Question 13

Find the upper quartile (Q3) of: 25, 23, 2, 6, 15, 28, 18

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Question 14

A box plot of reaction times (hundredths of a second) shows: minimum 9, Q1 16, median 18, Q3 28, maximum 35. What is the interquartile range?

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Question 15

Find the interquartile range (IQR) of: 59, 25, 37, 45, 24, 28, 40, 39

Answer 

Question 16

Find the lower quartile (Q1) of: 14, 5, 9, 50, 15, 50, 16, 45, 46, 40, 33

Answer