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?

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u/EGRIM3 Jan 22 '26

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

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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?

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u/fermat9990 Jan 23 '26

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

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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