Measures of Position

Divide a distribution into four equal parts. Q₁ or the first quartile locates the point which is greater than 25% of the items in the distribution.

• Decile

• Percentile

• Quartile

Q₃ is the 3^rd quartile means that

• 25% of the observations lie below this value

• 50% of the observations lie below this value

• 75% of the observations lie below this value

• 100% of the observations lie below this value

are values that divide the distribution into 100 equal parts.

• Decile

• Percentile

• Quartile

are values that divide a distribution into 10 equal parts

• Decile

• Quartile

• Percentile

The scores of students in a Mathematics seatwork are: 7, 4, 3, 6, 7, 4, 8. Find the median.

• 6

• 4

• 8

• 7

9, 12, 19, 10, 26, 24, 17, 15, 30, 17, 5, 9, 15, 8, 17, 12, 15, 20, 21. Find the D₇ score

• 17

• 19

• 17.6

• 19.6

9, 12, 19, 10, 26, 24, 17, 15, 30, 17, 5, 9, 15, 8, 17, 12, 15, 20, 21. Solve for P₅₀

• 15

• 17

• 15.5

• 17.5

5, 8, 9, 9, 10, 12, 12, 15, 17, 19, 20, 26, 21, 24, 30. Find the D₄ score.

• 12

• 10

• 15

• 17

The median score is also the

• 75th percentile

• 3rd decile

• 5th decile

• 1st quartile

The lower quartile is equal to

• 25th percentile

• 50 percentile

• 2nd decile

• 3rd quartile