Calculate the theoretical percentage of water in nickel(II) chloride hexahydrate, NiCl2 6H2O.

The Tracking Signal is -0.58. The Tracking Signal is a measure of how well a forecast is predicting actual demand. It is calculated by dividing the cumulative error by the Mean Absolute Deviation (MAD). The cumulative error is the sum of the differences between actual demand and forecasted demand, while the MAD is the average of the absolute values of these differences. In the table above, we can calculate the error for each period by subtracting the forecast from the actual demand. For example, in period 1, the error is 105 - 100 = 5. We then calculate the cumulative error by summing up all the errors. In this case, the cumulative error is -6. Next, we calculate the MAD by taking the absolute value of all the errors, averaging them, and rounding to the nearest whole number. In this case, the MAD is 5. Finally, we calculate the Tracking Signal by dividing the cumulative error by the MAD. -6/5 = -1.2. This means that, on average, the forecasts are overestimating actual demand by 1.2 units. However, when using the Tracking Signal as a measure of forecast accuracy, we also want to know if the deviations are random or systematic. A value between -4 and 4 is generally considered acceptable, indicating random variation. The value of -0.58 falls into this range, indicating that the deviations are likely due to random variation and not a systematic bias in the forecast.