Understanding Quartiles in Data

What is the first quartile (Q1) in the data set: 3, 7, 8, 12, 14, 18, 20?

• 8

• 14

• 7

• 12

Calculate the third quartile (Q3) for the following data: 5, 10, 15, 20, 25, 30, 35, 40.

• 32.5

• 40

• 30

• 35

Identify the position of the median in a data set of 9 numbers.

• 3rd position

• 5th position

• 7th position

• 1st position

What do you call the other term for Q3?

• lower quartile

• upper quartile

• three quartile

• median

How do you find the quartile positions in a data set of 12 values?

• Q1 at position 2, Q2 at position 5, Q3 at position 8

• Q1 at position 3, Q2 between positions 6 and 7, Q3 between positions 9 and 10.

• Q1 at position 4, Q2 at position 6, Q3 at position 11

• Q1 at position 1, Q2 at position 3, Q3 at position 7

Given the data set: 2, 4, 6, 8, 10, 12, 14, 16, calculate Q1 and Q3.

• Q1: 5, Q3: 13

• Q1: 6, Q3: 14

• Q1: 3, Q3: 15

• Q1: 4, Q3: 12

It is equal to less than or equal to 50% of the data?

• Q1

• Q4

• Q3

• Q2

It is a number such that at most three-fourths or 75% of the data are smaller in value than 3, and at most one-fourth or 25% are larger.

• FIRST QUARTILE

• SECOND QUARTILE

• THIRD QUARTILE

• MEDIAN

What do you call the other term for Q3?

• lower quartile

• upper quartile

• Three Quartile

• Median

In a data set of 15 values, what is the formula to find the position of Q2?

• 9

• 10

• 7

• 8