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Respond to OTA: Basically the first equation is the joint pdf of a sample maximum and minimum - if I am not wrong - it is just the formula.

Respond to OTA: Basically the first equation is the joint pdf of a sample maximum and minimum - if I am not wrong - it is just the formula.
The problem is finding the joint pdf from the sample size drawn from the pdf (2nd equation given between the bolded text ). So basically A(1) and A(n)corresponds only to the 2nd equation ( f(a) =(k+1)a^k/c^(k+1) )- hope that helps. Let me know if you need further clarification.....that is the way the question was set and it is really confusing for me. Thanks.
Part A
Joint pdf of a sample maximum and minimum is as below
Where a
Find the joint pdf  of the largest and smallest observations , denoted A(n) and A(1) respectively, in a sample of n drawn from the pdf below:
Where 0≤ a ≤ c
Part B
Find the general formula for the moment below if n=3, k=1, c=1
Find the value of the correlation between the largest and the smallest observation in such a sample

Part A
Joint pdf of a sample maximum and minimum is as below
Where a

Find the joint pdf of the largest and smallest observations , denoted
A(n) and A(1) respectively, in a sample of n drawn from the pdf below:
Where 0≤ a ≤ c
Part B
j
general formula for the moment below if n=3, k=1, c=1
Find the value of the correlation between the largest and the smallest
observation in such a sample

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