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The cost of cereal (X) has a mean of $4.00 and standard deviation $1.00. The cost of milk (Y) has a mean of $3.00 and

The cost of cereal (X) has a mean of $4.00 and standard deviation $1.00. The cost of milk (Y) has a mean of $3.00 and standard deviation $0.50. These prices are related with correlation = - .30. What is the mean of the combined cost of cereal and milk? What is the variance of the combined cost of cereal and milk? What is the standard deviation of the combined cost of cereal and milk

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