Fit a straight line trend by the method of least square (taking 1980 as year of origin) from the following data:
Year: 1980

Fit a straight line trend by the method of least square (taking 1980 as year of origin) from the following data:
Year: 1980 1981 1982 1983 1984 1985 1986
Production(in units) 125 128 133 135 140 141 143
Estimate the values for the years 1987 and 1989.

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