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.

IBM                                 AMZN
$169.64.....................$600.36
173.29 ........................613.40
180.13 ........................586.76
195.81 ........................544.10
196.69 ........................529.02
204.49 ........................506.38
222.52 ........................603.69
215.23 ........................540.96
216.23 ........................515.04
213.51 ........................592.64
192.29 ........................599.39
173.10 ........................645.90