The US energy information administration reported that the average price for a gallon of regular gasoline is $3.94. The US EIA updates its estimates of the average gas prices on a weekly basis. Assume the standard deviation is $0.25 for the price of a gallopn 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.  a. The desired margin of error is $0.10. b. The desired margin of error is $0.07.  use excel please

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