The u. s. energy information administration (us eia) reported that the average price for a gallon of regular gasoline is $3.95. the us eia updates its estimates of average gas prices on a weekly basis. assume the standard deviation is $.24 for the price of a gallon of regular gasoline and recommend the appropriate sample size for the us eia to use if they wish to report each of the following margins of error at 95% confidence. round up to the next whole number.

a. the desired margin of error is $.10. the appropriate sample size is

b. the desired margin of error is $.06. the appropriate sample size is

c. the desired margin of error is $.04. the appropriate sample size is