The Current Population Survey records the incomes of a large sample of American

Question

The Current Population Survey records the incomes of a large sample of American households. To briefly describe the distribution of household income, it is best to use
Answer
the mean and standard deviation
the mean and the median
the five-number summary
a regression line

I believe this answer is the five-number summary.

Scores x on the SAT verbal test among Kentucky high school seniors in a recent year were normally distributed with mean 420 and standard deviation 80. The scores y of the same students on the SAT mathematics test were normally distributed with mean 440 and standard deviation 60. The least-squares regression line for predicting math score from verbal score has the equation y = 0.6x + 188

About what percent of all students taking the exam were above average on both the verbal section and the mathematics section?
Answer more than 50%
about 50%
more than 25%
less than 25%

I believe this answer is about 50%

Scores x on the SAT verbal test among Kentucky high school seniors in a recent year were normally distributed with mean 420 and standard deviation 80. The scores y of the same students on the SAT mathematics test were normally distributed with mean 440 and standard deviation 60. The least-squares regression line for predicting math score from verbal score has the equation y = 0.6x + 188

Among those students whose verbal test scores were at about the 30th percentile, most probably had mathematics test scores that were
Answer above the population median
at about the population median
below the 30th percentile
above the 30th percentile

I believe this answer is below the 30th percentile

Scores x on the SAT verbal test among Kentucky high school seniors in a recent year were normally distributed with mean 420 and standard deviation 80. The scores y of the same students on the SAT mathematics test were normally distributed with mean 440 and standard deviation 60. The least-squares regression line for predicting math score from verbal score has the equation y = 0.6x + 188

For those students who scored 500 on the verbal test, the mean score on the mathematics test was
Answer 440
488
500
Can’t be determined

I believe this answer is 488

Like I said I have already answered the homework questions, and I am just looking for someone to check over them before I submit them online. I would greatly appreciate it!

Explanation / Answer

I found the answers myself :)

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