Simple exponential smoothing is being used to forecast demand. The previous forecast of $66$ turned out to be $3$ units less than actual demand. The next forecast is $66\mathrm{.}6,$ implying a smoothing constant, alpha, equal to:Simple exponential smoothing is being used to forecast demand. The previous forecast of $66$ turned out to be $3$ units less than actual demand. The next forecast is $66\mathrm{.}6,$ implying a smoothing constant, alpha, equal to: