Question 1181814
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Let's say that there are 2000 schools in this county.


If that's the case, then 77% of them use digital content in some way. That means 0.77*2000 = 1540 schools use digitial content.


Of those 1540 schools, 13 out of 20 of them use the digital content as part of the curriculum. 


That must mean (13/20)*1540 = 1001 schools use the digitial content as part of the curriculum. 


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We have A = 1001 schools that use digital content and use it as part of the curriculum. This is out of B = 2000 schools overall.


The probability we want is A/B = 1001/2000 = 0.5005
which rounds to  <font color=red>0.501</font> when rounding to three decimal places. 


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Answer: <font color=red>0.501</font>
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