Question

I got .1201, but it is not an option. Help?

Yet again, Mark has arrived in Statistics class, totally ill-prepared for a 20-question true-false test. If he guesses on each of the questions, and if a passing score on the test is a score of 60% or better, what is the probability that Mark will pass the quiz?

0.748

0.375

0.154

0.252

0.026

Answer 1

We have given,

60% of 20=12

=1-0.7483.................by using Excel =BINOMDIST(11,20,0.5,TRUE)

=0.252

Therefore, the probability that Mark will pass the quiz = 0.252