The table below shows the closing monthly stock prices for IBM and Amazon. Calculate the simple three- month moving average for each month for both companies. (Input all amounts as positive values. Do not round intermediate calculations. Round your answers to 2 decimal places.) January February March April May June July August September October November December IBM $ 181.04 180.89 204.07 221.08 187.57 213.23 247.79 191.86 225.35 215.79 200.84 178.42 AMZN $ 627.91 633.92 559.97 551.70 489.50 483.58 609.39 532.41 510.10 611.83 582.86 666.80 IBM AMZN ........ March April May June July August September October November December