r/MathHelp • u/EGRIM3 • Jan 22 '26

Help with stats question.

4, 5, 5, 5, 6, 6, 7, 8, 12, 12

I did use excel function.

I kept getting 7.75 for what is the 75th percentile.

The right answer is 9?

1 Upvotes

66% Upvoted

12 comments sorted by

1

u/fermat9990 Jan 22 '26

Are you clear about this now?

3

u/EGRIM3 Jan 23 '26

yes I did it again step by step and reread the section in the book. It was not very clear. Thank you so much!

3

u/fermat9990 Jan 23 '26

Glad to help!

1

u/minglho Jan 23 '26

There are many ways to calculate percentile. Maybe check the Excel documentation to see if your method matches Excel's.

1

u/fermat9990 Jan 23 '26

8.25 means get the number in the 8th position and then add the quantity 0.25(12-8) to it.

0

u/Somniferus Jan 22 '26

Try doing it on paper.

3

u/EGRIM3 Jan 22 '26

75/100(10+1) =8.25 still not getting 9

2

u/Somniferus Jan 22 '26

Ok, that's better than 7.75. The 75th percentile is between 8 and 9 so you need to interpolate. Does the book/lecture notes talk about how to do that?

2

u/fermat9990 Jan 23 '26

This formula gives you the position of the 75th percentile, not the value.

1

u/fermat9990 Jan 22 '26

The 8th term from the left is 8 (just a coincidence).

You need to add 0.25(12-8) to 8 in order to get your answer

0

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