The average natural gas bill for a random sample of 21 homes in the 19808 zip code during the month of March was $311.90 with a sample standard deviation of $51.60. The approximate standard error of the mean for this sample is _____ .
A)8.20
B)14.74
C)9.93
D)11.27

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The Answer of The average natural gas bill for a random sample of 21 homes in the 19808 zip code during the month of March was $311.90 with a sample standard deviation of $51.60. The approximate standard error of the mean for this sample is _____ .
A)8.20
B)14.74
C)9.93
D)11.27

The Average Natural Gas Bill for a Random Sample of 21