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In a given population of two-earner male/female couples, male earnings have a mean of $40, 000 per year and a standard deviation of $12, 000.

In a given population of two-earner male/female couples, male earnings have a mean of $40, 000 per year and a standard deviation of $12, 000. Female earnings have a mean of $45, 000 per year and a standard deviation of $18, 000. The correlation between male and female earnings for a couple is 0.80. Let C denote the combined earnings for a randomly selected couple.

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