Question 1162349
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The question in this post


<pre>
    What is the probability that they wear glasses while driving even though they do not need to wear them?
</pre>

is posed &nbsp;INCORRECTLY, &nbsp;since it does not define who are that &nbsp;"they".



A &nbsp;RIGHT &nbsp;question should be


<pre>
    If a person is selected randomly from these 1000 people, 

    then what is the probability that he (or she) wears glasses while driving even though he (or she) does not need to wear them?
</pre>

Then the answer, &nbsp;as it is &nbsp;OBVIOUS, &nbsp;is   &nbsp;&nbsp;{{{20/1000}}} = {{{1/50}}}.


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Your post is fixed; &nbsp;the problem is solved; &nbsp;the question is answered and the solution is completed.