In Python:

#Q.4: We want to write a function to find harmonic mean. # see more about https://en.wikipedia.org/wiki/Harmonic_mean # Assume that we want to pass unknow number of arguments represented by vars to the function '?' HarmonicMean('?'vars): #(2 points( x = '?' '?' var in '?': x += '?' return '?'/x # now we want to test the code for numbers from 1 to 10 (included). vars = '?'(range(1,11)) # 1 point print(HarmonicMean('?'vars))