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Using the summary statistics, determine the sample mean and variance of a state's total energy consumption for these major sources. ( ( b ) )

Using the summary statistics, determine the sample mean and variance of a state's

total energy consumption for these major sources.

(

)

Determine the sample mean and variance of the excess of petroleum consumption

over natural gas consumption. Also find the sample covariance of this variable with

the total variable in part a

.

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