The weekly salary paid to employees of a small company that supplies part-time laborers averages $850

with a standard deviation of $550.

(a) If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.

(b) If every employee receives a year-end bonus that adds $100 to the paycheck in the final week, how does this change the normal model for that week?

(c) If every employee receives a 5%salary increase for the next year, how does the normal model change?

(d) If the lowest salary is $300 and the median salary is $575 does a normal model appear appropriate?