estimate here how inaccurate we are if we use the number of deaths today for predicting the number of deaths tomorrow. The number of deaths on October 4 is 25076-25064 = 12, and on October 3, is 25064-25050 = 14. If we use October 3 data to predict October 4 number of deaths we obtain this error: $|14 - 12| = 2$. In the next cell, **using only the array `deaths`**, calculate the average error over the past 573 days if using this prediction method.