2. Write a script file that will prompt the user an arbitrary number of positive input values and will solve the harmonic mean of the numbers. Display an error message when the user input a negative number. Test your program by computing the harmonic mean of five numbers: 1, 4, 9, 12, and 20. Use the formula for harmonic mean: N harmonic mean 1 1 1 + t...t X1 X2 XN Use while loop OR for loop.