How do I work this problem? 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 .80.Let C denote the combined earnings for a randomly selected couple?

answer; im thinking the correct answer is (7years);

answerit is the safest endorsement for business;

credit history is used by lenders to determine whether you are a 'risky' person to give their money to.

having a short history provide very little data for the lenders. they wouldn't be able to determine your credit behavior from such a small samples. even if they are perfect.

having long credit history with few blemishes provide larger and more accurate data for the lenders to predict your credit behavior.