A and B: m = 3/4
C and D: m = 1/2
E and F: m = 1/6
Just use the distributing property and combine like terms. There isn’t a definite answer since it is an expression.
Answer: $85,000
Step-by-step explanation:
Given : 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.

If C denote the combined earnings for a randomly selected couple.
Then, the mean of C will be :-

Hence, the mean of C = $85,000
3,200?? (it may not be right I'm sorry.)