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Easy

300

Which quartile represents the 75th percentile?

A. Q₁
B. Q₂
C. Q₃
D. Q₄

C. Q₃

400

If Q₁ = 15, what does this mean?

A. 75% of data are below 15
B. 25% of data are below or equal to 15
C. 50% of data are above 15
D. All data are above 15

B. 25% of data are below or equal to 15

500

Two data sets have the same Q₂ but different Q₁ and Q₃ values. What does this imply?

A. The data sets are identical
B. They have equal variability
C. They have different spreads
D. They have the same maximum value

C. They have different spreads

Average

300

Which quartile is also called the median?

A. Q₁
B. Q₂
C. Q₃
D. Q₄

B. Q₂

400

If n = 12, what is the position of Q₁?

A. 3rd
B. 4th
C. 5th
D. 6th

B. 4th

500

Find Q₂.

Data:
5, 10, 15, 20, 25

A. 15
B. 17.5
C. 20
D. 10

A. 15

Difficult

300

Find Q₁.

Data:
5, 8, 12, 15, 18, 20, 22, 25, 30

A. 5
B. 8
C. 12
D. 15

C. 12

400

If n = 9, what is the position of Q₃?

A. 6th
B. 7th
C. 8th
D. 9th

B. 7th

500

If n = 19, what is the position of Q₃?

A. 13th
B. 14th
C. 15th
D. 16th

C. 15th