Answer
$0.5$
Work Step by Step
Step 1: $1542$ lb can represent any value between $1541.5$ lb and $1542.5$ lb.
Step 2: Substituting both the ends of this range into the inequality should give the same result:
$|1542.5-1542|\leq x$
$|0.5|\leq x$
$0.5\leq x$
$|1541.5-1542|\leq x$
$|-0.5|\leq x$
$0.5\leq x$
Step 3: Therefore, the answer is $0.5$.