Almost all employees working for financial companies in New York

Almost all employees working for financial companies in New York City receive large bonuses at the end of the year. A sample of 65 employees selected from financial companies in New York City showed that they received an average bonus of $55,000 last year with a standard deviation of $18,000. Construct a 95% confidence interval for the average bonus that all employees working for financial companies in New York City received last year.