NOTE: Code should be written in Haskell

To compute a weighted average of several values, you assign each value upsilon_i a weight w_i. The weighted average is the average, where each value is added in proportion to its weight: sigma w_i upsilon_i/sigma w_i. Write code for the function weightAvg. that takes in a list of weights and a list of values, and computes a weighted average of the values. You are welcome to write helper functions as needed