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mathinator mathinator
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6 years ago
The monthly gas bill (in dollars) for a typical family from May 2009 to April 2010 is summarized in the following table.

Month          MAY           JUN            JUL              AUG           SEP        OCT         NOV         DEC           JAN
Amount       94.57        55.99        41.15             36.15       48.64       74.97       142.02    195.46        237.97

Month           FEB             MAR             APR
Amount        238.2        219.14          170.31


(a)Compute the mean of the amount of the gas bill for a typical family, for the 12-month period under consideration.

(b)Compute the standard deviation for the data (round to fourdecimal places).
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bolbolbolbol
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mathinator Author
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6 years ago
Smart ... Thanks!
elizabetheldrid
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Shuqin
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Helped a lot
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