Suppose sum, num, and j are int variables, and the input is 4 7 12 9 -1. What is the output of the following code? 
Definitions:
Mean Squared Error
A measure of the average of the squares of the errors or deviations, that is, the difference between the estimator and what is estimated.
Tracking Signal
A statistical measure used in quality control and forecasting to detect bias in the forecast error over time.
Simple Moving Average
A mathematical method used in finance and economics to calculate the average of a selected range of prices or quantities over a specific period of time.
Exponential Smoothing
Exponential smoothing is a forecasting technique that applies decreasing weights to past observations, with more recent data given more significance.
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