Question: In 1982 The US Corps of Engineers published a prediction and presented it to, as they did every year the members of the Upper Mississippi Waterways Towing Association. It took the years 1974- 1980, ( actually the real number of years was 1938-1980 ) and represented millions of tons of grain shipped to the Gulf by Barge. Then a prediction for 1985 was provided.

Recalculate their estimate

There are 2 problems with this analysis, Briefly, What are they?

1974 24

1975 31

1976 34

1977 39

1978 42

1979 47

1980 53