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Default Third Quartile (75th Percentile

I know the definition of 3rd quartile and I know the formula in excel but
could not figure out how excel calculates it so I can explain it at my trial.
My population is relatively small 1.22x, 1.12x, 3.11x and 0.85x. the median
is 1.17x the 1st quartile is 1.05x and the 3rd quartile is 1.69x. I tried to
figure out how excel calculates these quartiles when the population is not
big enough. I really appreciate your help and thank you in advance.
 
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