Compute a three$-$period moving average forecast given demand for shopping carts for the last five periods. $($Round all your answers to two decimal points.$)$ Period $12345$ Demand $5451555156.$ Calculate the Moving average forecast for Forecast period $4$ Forecast period $5$ Forecast period $6.$

If actual demand in period $6$ turns out to be $54,$ the moving average forecast for period $7$ would be