The gasoline prices in seven states are $1.96, $2.09, $1.79, $1.61, $1.75, $2.11, and $1.84. the median gasoline price is . the difference of the first and third quartiles in this set of gas prices is . nextreset

$1.61, $1.75, $1.79, $1.84, $1.96, $2.09, $2.11
The one that is in the exact middle is $1.84 so this is the median.
To find the difference between the first ($1.61) and third ($1.79) ,subtract $1.61 from $1.79.
$1.79 - $1.61 = $0.18