18. [10] The technique of estimating the next value in a series by taking the weighted average of the current measured value and the previous estimate is sometimes called aging. Suppose that the estimated time per command for some terminal is To. Now suppose its next run is measured to be T1. We could update our estimate by taking a weighted sum of these two numbers, that is a To+ (1-a) T1 The aging algorithm with a = % is being used to predict run times. The previous four runs, from oldest to most recent, are 40, 20, 40, and 15 msec. What is the prediction of the next time