6. Therefore, 70% of the vendors have sales less
than or equal to 43.48.
7.
8.
9. Analysis
• 1. What are the steps in finding the
decile of grouped data?
• 2. What are the steps in finding the
quartile of grouped data?
• 3. What are the steps in finding the
percentile of grouped data?
• 4. How do we interpret the computed
quartile? Computed decile? Computed
percentile?
10. Guided Practice
Mrs. Mojica conducted a Scrabble
competition with 10 participants.
Calculate the following:
• a. Find the 2nd quartile
• b. Find the 5th decile
• c. Find the 30th percentile
11. Independent Practice
• Zumba is regarded as a good stress
reliever and fat-burning dance and fitness
exercise. It provides a workout for the whole
body and builds up good cardiovascular
respiratory system. A study was conducted in
Cavite State University to determine the average
exercise intensity and energy expenditure during
a 40-minute Zumba class. A sample of twenty
students showed the following energy
expenditure (in Kcal) throughout the session:
12.
13. where:
LB = lower boundary of the Qk class
N = total frequency
<cfb = cumulative frequency of the class before
the Qk class
fQk= frequency of the Qk class
i = size of class interval
k = nth quartile, where n = 1, 2, and 3
14.
15.
16. Alden has an assignment to ask at
random 10 students in their school
about their grades in Mathematics in
the Third Quarter. The data are listed
in the table below.
