Working on a Percentile question

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Question: A university wants to estimate the unknown 25-percentile height, pi0.25 (in cm), of its students. A random sample of 180 students is produced and the height of each student in the sample, Xi (i= 1,2, … 180), is measured. The order statistics of Xi is denoted as Xi’. What is the level of confidence(in %) for X40<pi 0.25< X’50?

So if I am applying the formula for the percentile correctly, which idk if i am, it should turn out something like

P[pi0.25] = C0.500.4(1-0.25)2

Then from there try to calculate the confidence but I don’t know what I can apply to find the CI

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