Question: Please help me solve this problem i'm lost conceptually and mathematically, I understand that I have to take the derivation of the loss function and

Please help me solve this problem i'm lost conceptually and mathematically, I understand that I have to take the derivation of the loss function and show that it equals the harmonic mean however I am not good at deriving with sigma notation and I don't know how to answer part C) and part D) mathematically. Thank you for your expert help!

In this problem, suppose all n data values in a data set are positive, with 0

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