IBM AMZN March April May June July August September October November December 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.) AMZN $ 170.24 601.81 614.48 585.35 544.50 526.94 505.18 603.99 540.51 514.78 593.65 598.52 647.00 IBM January February March April May June July August September October November December 173.69 181.39 197.14 196.21 204.95 223.85 214.00 216.71 213.63 192.74 173.38 IBM AMZN March April May June