A manager has been using a certain technique to forecast demand for gallons of ice cream for the past six periods. Actual and forecasted amounts are shown below. Period Demand Forecast 1 90 87 2 85 88 3 91 87 4 92 89 5 95 90 6 88 92 If the errors are assumed to be normally distributed with CL=0, LCL= -4.5 and UCL= +4.5, in which period are the errors out of control? Period 3 Period 6 Period 3 and 6 Period 5 None of the other options are correct