Question 1122846
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The inequality the problem asks for is <U>THIS</U> :


    |T - 91.2| >= 3.5.


Its solutions are the sets of the temperature T values that are remoted from 91.2 at least by 3.5.


These values fall in two sets:  a)  T <= 91.2-3.5 = 87.7,   and  b)  T >= 91.2+3.5 = 94.7.


<U>Answer</U>.  The solution is the union of these two sets  {T <= 87.7} U {T >= 94.7}.
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Solved.