Your friend has two jobs. She works a different number of hours each week, so her paycheck for each job is different from week to week. Her average weekly paycheck is $110 for job one and $75 for job two. What is her average weekly income if these are her only jobs?
Would the answer be $185 or $92.5?
"Average" is misleading. she is earning income from both jobs to determine her weekly average.
$110 + $75 = $185
But the question doesn't mention anything about combining the two variables into a new random variables, so we wont' add.
To find your friend's average weekly income, you need to calculate the average of her weekly paychecks from both jobs.
Given that her average weekly paycheck for job one is $110 and her average weekly paycheck for job two is $75, you can simply add these two numbers together and then divide by the total number of jobs (which is 2 in this case).
So, the calculation would be:
($110 + $75) / 2 = $185 / 2 = $92.50
Therefore, your friend's average weekly income if these are her only jobs would be $92.50.