QUARTILES FOR GROUPED DATA

1. What measures of position divides a distribution into 4 equal parts?

• Quantile

• Quartile

• Decile

• Percentile

2. What is the formula in solving for the quartile of grouped data?

3. It is also called the lower quartile.

• first quartile

• second quartile

• third quartile

• median

4. What percent corresponds to Q₃?

• 25%

• 30%

• 50%

• 75%

5. Which of the following is/are considered as a median score?

• Q₁

• Q₂

• Q₃

• D₂

For numbers 6-10.

A health officer wants to determine the height that marks the lower 25% of the population of 80 Grade 10 students in a school. The frequency distribution of the heights (in cm) is given below.

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Answer explanation

The heights in the lower 25% of the population of 80 Grade

10 students in the school can be determined by checking the heights below Q1. Recall that Q1 divides data into the lower 25% and the upper 75%.