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Our foamily owned a sari-sari store, then my dad noticed that the sales of our Coca-Cola product was erratic from Monday to Sunday. He said that the sales from day 1 has a total of 15 then it became 16 then 7, 13, 11, 15, 10 in the following day.
Sure mom, I can help you on that thing
Hey Hannah , can you help me to find the value of the 40th percentile of our Coca-Cola product?
so mom, the first thing we need to do is to arrange all the values in ascending order. Then, we will use the formula Pk = k/100(n+1)
Therefore, the arrangement of the values will become 7, 10, 11, 13, 15, 15, 16
Okay, that's great!
Then, substitute the given numbers to the formula. which n = 7 and k = 40 
P40 = 40/100 (7+1)P40 = (8) 40/100P40 = 320/100P40 = 3.2
Okay okay I think get it
but mom, this is not the exact position of the value that we are finding.
P40 = 40/100 (7+1)P40 = (8) 40/100P40 = 320/100P40 = 3.2
Hmm.. do you have any idea?
Hmmm.. I think we need to round off the value that we got earlier??
Great job mom you're right! so the estimated value will become 3, then the 3rd position in the given data is 11
P40 = 40/100 (7+1)P40 = (8) 40/100P40 = 320/100P40 = 3.2
7, 10, 11, 13, 15, 15, 16
And also, the meaning of the value 3.2 is the position of 40%
So mom, the value of the 40th percentile that we were looking earlier is only 11!
Thank you my daughter you helped me a lot!

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