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Answer:
 |m-2.5| ≤ 0.08
 2.42 ≤ m ≤ 2.58
Step-by-step explanation:
The equation of interest is the one that says the positive difference from the ideal mass is at most 0.08 ounces:
 |m -2.5| ≤ 0.08 . . . an absolute value inequality
The solution is found by solving the equivalent compound inequality:
 -0.08 ≤ m -2.5 ≤ 0.08
 2.42 ≤ m ≤ 2.58 . . . . the range of masses
