Recent statistics show that the average annual base salary of a woman working as an editor in the region's advertising agencies is lower than the average annual base salary of a man. The average annual base salary of a woman is $75,000, that of a man $80,000. Assume wages are normally distributed, with a standard deviation of $7,000 for men and $6,500 for women.

If we are interested in the difference between two wages (that of a man minus that of a woman) assuming that they are independent, the parameters of the normal distribution corresponding to this difference are: