SAT Prep

Answer to Math #5

Answer:  C
Difficulty: Medium

The mean is pulled when there are some very high or very low values, relative to the rest of the values.

Imagine a that ten houses are valued at $175,000.

$175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000

The mean (average) of these homes is $175,000 and the median (middle number) is also $175,000

Now imagine that a 3 houses are added that cost 1 million dollars, each.

$175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000 $175,000$175,000 $1,000,000, $1,000,000, $1,000,000

The mean (average) of these values is $365,385, but the average (middle number) is still $175,000.

The mean got pulled toward the extreme (in this case higher) values, but the median was unaffected.