a firm has the following order history over the last 6 months (see appended information). what would be a 4-month weighted moving average forecast for july using weights of 30% for the most recent month, 50% for the month preceding the most recent month and 40% for the month preceding that one and 20% for the last month? is the actual demand over the last four months indicative of a trend (i.e. time series trend characteristic) according to company forecasters?