The monthly income of 5,000 workers at the Microsoft plant is distributed normally. Suppose the mean monthly income is $1,250 and the standard deviation is $250. I. How many workers earn more than $1500 per month? II. How many workers earn less than $755 per month? III. What percentage of the workers earn between $1100 and $1570 per month? IV. What is the percentage of workers who earn less than $1750 per month? V. If new taxes policy to be applied from next year on the lowest 5% of workers with low income, what is the income from which the policy will be implemented? VI. If new social insurance policy to be applied from next year on the highest 20% of workers with high income, what is the salary from which the new policy will be implemented? VII. What is the number of workers whose salaries range by 500$ around population mean?