4. Fairly accurate exponential smoothing forecasting models can be built once the salient characteristics of the time series to be forecast are properly identified. Two of these characteristics are and .

smoothing coefficient or base factor, seasonality factor

Step-by-step explanation:

base factor: amount of smoothing that takes place over a period of time

Seasonality factory: the variation within a single period

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

answer: median

step-by-step explanation:

the median is the middle value when a data set is ordered from least to greatest