Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Player | Country | Year(s) won | Total | To par |
| --- | --- | --- | --- | --- |
| Bob Tway | United States | 1986 | 144.0 | 2.0 |
| Jack Nicklaus | United States | 1963 , 1971 , 1973 1975 , 1980 | 144.0 | 2.0 |
| Raymond Floyd | United States | 1969 , 1982 | 144.0 | 2.0 |
| Wayne Grady | Australia | 1990 | 145.0 | 3.0 |
| John Mahaffey | United States | 1978 | 147.0 | 7.0 |
| David Graham | Australia | 1979 | 157.0 | 15.0 |
Question:
What was the average round score of the player who won in 1978?
Answer:
147.0