Question 350694
There are 2 answer choices, with only 1 being correct.  Therefore you have a 50% chance at getting the correct answer.  If you need 7/10 of the test correct you can multiply the 50% chance by 7/10.
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{{{(5/10)*(7/10)=(35/100)}}}
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Therefore, you have a 35 percent chance at passing if you guess on all of the questions.