-2 2/3 divided by 1 5/6 + 2 NO MIXED NUMBERS
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Each question has four choices, then the probability to guess a correct answer is 
and the probability to select incorrect choice is 
.
You have a 5-question multiple-choice test, then n=5. The <span>probability that you will guess exactly three out of five questions correctly is </span>
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.
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You have a 5-question multiple-choice test, then n=5. The <span>probability that you will guess exactly three out of five questions correctly is </span>
<span /><span>
</span><span>
<span />