A major credit card company has determined that its customers charge an average of $260 per month on their accounts with a standard deviation of $20. (You may need to use the appropriate appendix table or technology to answer this question. Round your answers to two decimal places.)

(a)What percentage of the customers charges more than $255 per month?

%

(b)What percentage of the customers charges less than $247 per month?

%

(c)What percentage of the customers charges between $248 and $308.60 per month?

%