Worksheet: Quartiles of a Data Set

In this worksheet, we will practice finding the median and upper and lower quartiles of a data set.

Q1:

Determine the median and quartiles of the following set of data: 56, 55, 90, 50, 41, 84, 68, 75, 92, 50, and 71.

  • AThe median is 68, and the quartiles are 52.5 and 79.5.
  • BThe median is 69.5, and the quartiles are 50 and 84.
  • CThe median is 68, and the quartiles are 50 and 84.
  • DThe median is 71, and the quartiles are 55 and 90.

Q2:

Determine the median and quartiles of the following set of data: 1.8, 1.6, 1.1, 2.4, 0.6, 1.3, 2.9, 1.5, 0.4, 1.9, 2.9.

  • AThe median is 1.6, and the quartiles are 1.3 and 2.9.
  • BThe median is 1.6, and the quartiles are 1.1 and 2.4.
  • CThe median is 1.8, and the quartiles are 1.1 and 2.4.
  • DThe median is 1.6, and the quartiles are 0.6 and 1.9.

Q3:

Determine the upper and the lower quartiles of the following set of data: 114, 103, 50, 52, 95, 103, 93, 53, 65, 57, 52, 89, 111, 89, and 96.

  • Alower quartile =50, upper quartile =103
  • Blower quartile =53, upper quartile =103
  • Clower quartile =53, upper quartile =89
  • Dlower quartile =50, upper quartile =89
  • Elower quartile =89, upper quartile =103

Q4:

The table shows the capacities of 6 sports stadiums around the world. Describe how the lower quartile will be affected if Emirates Stadium, London, United Kingdom, which has a capacity of 60,338, is included in the data.

StadiumLocationCapacity
Gelora Sriwijaya StadiumPalembang, Indonesia40,000
OlympiastadionBerlin, Germany74,228
FrankenstadionNuremberg, Germany48,548
Memorial StadiumNebraska, United States86,047
Borg El Arab StadiumAlexandria, Egypt86,000
Stamford BridgeLondon, United Kingdom42,055
  • AThe lower quartile will remain unchanged at 42,055.
  • BThe lower quartile will increase from 42,055 to 42,058.
  • CThe lower quartile will increase from 42,055 to 86,047.
  • DThe lower quartile will remain unchanged at 42,058.
  • EThe lower quartile will decrease from 42,058 to 42,055.

Q5:

Determine the median and quartiles of the following set of data: 1,350, 1,400, 1,250, 1,050, 1,450, 1,150, 1,000.

  • AThe median is 1,250, and the quartiles are 1,150 and 1,350.
  • BThe median is 1,350, and the quartiles are 1,050 and 1,400.
  • CThe median is 1,250, and the quartiles are 1,100 and 1,375.
  • DThe median is 1,250, and the quartiles are 1,050 and 1,400.

Q6:

Determine the upper and the lower quartiles of the following set of data: 19.4, 42.1, 56.1, 27.5, 5.3, 49.9, 48.8, 44.3, 13.1, 15.4, 20.1, 4.1, 38.1, 33.8, and 41.5.

  • Alower quartile = 4.1, upper quartile = 44.3
  • Blower quartile = 33.8, upper quartile = 44.3
  • Clower quartile = 4.1, upper quartile = 33.8
  • Dlower quartile = 15.4, upper quartile = 33.8
  • Elower quartile = 15.4, upper quartile = 44.3

Q7:

David’s history test scores are 74, 96, 85, 90, 71, and 98. Determine the upper and lower quartiles of his scores.

  • Alower quartile = 74, upper quartile = 96
  • Blower quartile = 87.5, upper quartile = 96
  • Clower quartile = 74, upper quartile = 87.5
  • Dlower quartile = 71, upper quartile = 98
  • Elower quartile = 96, upper quartile = 74

Q8:

Matthew’s scores in a card game were 4, 2, 1, 5, 5, 7, and 0. Determine the lower quartile and upper quartile of his scores.

  • Alower quartile = 4, upper quartile = 5
  • Blower quartile = 5, upper quartile = 4
  • Clower quartile = 2, upper quartile = 4
  • Dlower quartile = 1, upper quartile = 4
  • Elower quartile = 5, upper quartile = 1

Q9:

Select the pair of data sets which have the same median and quartiles, but different ranges.

  • A30, 41, 34, 34, 35, 49 and 31, 35, 42, 50, 35, 36
  • B58, 68, 57, 58, 54, 69 and 58, 69, 58, 54, 59, 57
  • C83, 77, 73, 88, 71, 84 and 69, 68, 58, 57, 62, 73
  • D16, 15, 25, 20, 16, 28 and 17, 15, 15, 28, 27, 20
  • E10, 10, 9, 11, 7, 8 and 6, 8, 10, 21, 9, 10

Q10:

The table shows the savings of a group of 8 children. Determine the lower and upper quartiles of the data.

ChildChild 1Child 2Child 3Child 4Child 5Child 6Child 7Child 8
Savings in Dollars35.0030.4018.3023.4029.5021.5033.5018.40
  • ALower quartile = $31.95, upper quartile = $19.95
  • BLower quartile = $19.95, upper quartile = $31.95
  • CLower quartile = $19.95, upper quartile = $26.45
  • DLower quartile = $26.45, upper quartile = $31.95
  • ELower quartile = $18.30, upper quartile = $35.00

Q11:

The table shows the number of students who partake in different physical activities. Find the lower and upper quartiles of the data.

ActivityBasketballCyclingSoccerRunningRope JumpingSwimmingClimbing
Number of Students71261415611
  • Alower quartile: 4, upper quartile: 12
  • Blower quartile: 6, upper quartile: 11
  • Clower quartile: 6, upper quartile: 14
  • Dlower quartile: 11, upper quartile: 14
  • Elower quartile: 6, upper quartile: 15

Q12:

The table shows DVD prices in dollars at various stores. What are the lower and upper quartiles of the data?

19.8623.8217.2724.01
23.5618.7416.7915.57
23.3920.8623.0420.25
  • Alower quartile = 18.74, upper quartile = 20.25
  • Blower quartile = 23.475, upper quartile = 18.005
  • Clower quartile = 20.555, upper quartile = 23.475
  • Dlower quartile = 18.005, upper quartile = 20.555
  • Elower quartile = 18.005, upper quartile = 23.475

Q13:

The number of goals scored by 12 soccer players during a season is 10, 9, 14, 20, 19, 20, 9, 5, 12, 9, 19, and 7. State whether the following statement is true or false: About three-fourths of the players scored 19 or more.

  • Afalse
  • Btrue

Q14:

The line plot shows the magnitudes of several recent earthquakes. Determine the upper and lower quartiles.

  • ALower quartile =2, upper quartile =3.5
  • BLower quartile =3.3, upper quartile =2.3
  • CLower quartile =2.3, upper quartile =2.7
  • DLower quartile =2.7, upper quartile =3.3
  • ELower quartile =2.3, upper quartile =3.3

Q15:

The times taken for a bus journey between two towns are normally distributed with mean 28 minutes and standard deviation 4 minutes. Calculate the lower and upper quartiles of the times taken. Round your answer to the nearest integer.

  • Alower quartile = 20, upper quartile = 36
  • Blower quartile = 22, upper quartile = 34
  • Clower quartile = 25, upper quartile = 31
  • Dlower quartile = 27, upper quartile = 29
  • Elower quartile = 26, upper quartile = 32

Q16:

The number of Bonus Bugs won by each of 15 students in the first level of a computer game tournament was recorded. The results are in the table below.

Find the median (Q2) and the lower and upper quartiles (Q1 and Q3) for the number of Bonus Bugs won.

  • AMedian = 22, Q1 = 29, Q3 = 17
  • BMedian = 15, Q1 = 17, Q3 = 31
  • CMedian = 15, Q1 = 22, Q3 = 29
  • DMedian = 21, Q1 = 18, Q3 = 31
  • EMedian = 22, Q1 = 17, Q3 = 29

If the organizers of the tournament decide that the top 25% of students can compete in Level 2, above what number of Bonus Bugs must a student win to go to the next level?

  • A15 or above
  • B29 or above
  • C31 or above
  • D17 or above
  • E22 or above

Q17:

In the second year of a computer game tournament, there were forty-two participants and the number of Bonus Bugs each one won in level 1 was recorded. The data are shown in the graph below where each bug represents one participant.

Find the median number of Bonus Bugs won and the upper and lower quartiles, Q1 and Q3.

  • AMedian = 25.5, Q1 = 21, Q3 = 30
  • BMedian = 25.5, Q1 = 19, Q3 = 32
  • CMedian = 28, Q1 = 21, Q3 = 30
  • DMedian = 28, Q1 = 23, Q3 = 29
  • EMedian = 26, Q1 = 23, Q3 = 29

The top 25% of participants can go on to play level 2 in the tournament. What score must the participants achieve to play level 2?

  • A26 or more
  • B30 or more
  • C25.5 or more
  • D32 or more
  • E29 or more

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