Forecast are usually less accurate than forecast

medium, long range and short term.

Explanation:

Forecasting is a process of making predictions on the future base of the past and present data and is commonly done by analysis if the trends.  And the most common is the estimation of the variables of the data in future reference time. Such as the occurrence of the floods. There is various types of forecasts like those of the judgmental, time series and the qualitative and the quantitative methods. The short-range forecast is usually for three months.  As compared to the long and the medium-range that has many variations. As most of them are quantitative. It depends on economic, technological and demand conditions.

(long term) forecast are usually less accurate than (short term) forecast.

C.about 10% i think