Recently, a University Surveyed Recent Graduates of the English Department

Recently, a university surveyed recent graduates of the English Department for their starting
Salaries. Four hundred graduates returned the survey. The average salary was $55,000. The
Population standard deviation is known to be $2,500.
What is the 90% confidence interval for the mean salary of all graduates from the English
Department?

A) 5,497, $55,039
B) 54,794, $55,206
C) 54,671, $55,329
D) 54,961, $5,539
E) 54,800, $55,200