Question 1201065
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This probability is the ratio of the lengths of two intervals.


The shorter interval is  2.1-0.1 = 2 units long.


The longer interval is 5-0.1 = 4.9 units long.


The probability under the problem's question is  {{{2/4.9}}} = 0.4082 (rounded).      <U>ANSWER</U> 
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Solved.