The University of Texas at Austin McCombs School of Business performs and reports an annual survey of starting salaries for recent bachelor's in business administration graduates. For 2019, there were a total of 684 respondents

a. Respondents who were finance majors were 38.6% of the total responses.Rounding to the nearest integer, what is n for the finance major sample?

b. For the sample of finance majors, the average salary is $72,125 with a standard deviation of $12,225. What is the 95% confidence interval for average starting salaries for finance majors?