SOLUTION: 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 8

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Question 1206622: 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.)
Answer by ikleyn(52852) About Me  (Show Source):
You can put this solution on YOUR website!
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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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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 ANSWER is  P = 0.05469.


Round it as you want.

Solved.