Question: 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.
((b)) 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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