Given the following history, use a three-quarter moving average to forecast the demand for the third quarter of this year. note, the 1st quarter is jan, feb, and mar; 2nd quarter apr, may, jun; 3rd quarter jul, aug, sep; and 4th quarter oct, nov, dec.

jan feb mar apr may jun jul aug sep oct nov dec
last year 130 150 155 215 225 230 175 165 155 230 255 280
this year 155 155 205 220 245 250
forecast for the third quarter
moving averages:
moving averages are used to smooth out fluctuations which have arisen over time and to predict future results based on current trends. moving averages, since they are based on data from prior periods, are called "lagging" indicators. this indicator may be calculated on a simple, cumulative, or weighted basis.