Question 1206622
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A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. 
Find the probability that the student passes the quiz with a grade of at least 80% of the questions correct. 
(Round your answer to three decimal places.)
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<pre>
This is a binomial experiment with n= 10 trials and p= 0.5 probability of the individual success.


They want you determine the probability of 8 or more successes 
(at lest 80% score of 10 questions means 8 or more correct answers).


You can use regular calculator TI-83/84 with standard function binomcdf, or Excel function BINOM.DIST,  
or free of charge online calculator https://stattrek.com/online-calculator/binomial.aspx


The <U>ANSWER</U> is  P = 0.05469.


Round it as you want.
</pre>

Solved.