Final Answer:
The calculated 3-month weighted moving average forecast for period 7 is 52.
Step-by-step explanation:
To calculate the 3-month weighted moving average forecast, we assign weights to the previous three months and sum the products of the weights and corresponding values. In this case, assuming the weights are w1, w2, and w3 for months 5, 6, and 7, respectively, the forecast for period 7 is given by

The specific weights depend on the method used; for simplicity, we can assume equal weights, making the calculation straightforward. Given the values 50, 51, 52 for periods 5, 6, and 7, respectively, the forecast becomes
Therefore, the calculated 3-month weighted moving average forecast for period 7 is 52.
Understanding and applying weighted moving averages is crucial in forecasting to smooth out fluctuations and identify trends. The weights assigned to each period determine the influence of past data on the forecast.
In this scenario, the equal weights provide a balanced consideration of the most recent three months, resulting in a forecast of 52 for period 7. This method allows businesses and analysts to make informed predictions based on historical data while adapting to changing trends.