SOLUTION: Please help me solve this question A test consists of 10 true or false questions. If the student guesses on each question: What is the mean number of correct answers? What is th

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Question 607889: Please help me solve this question
A test consists of 10 true or false questions. If the student guesses on each question: What is the mean number of correct answers? What is the standard deviation of the number of correct answers?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
mean:

mu = np = 10*(0.5) = 5


standard deviation:

sigma = sqrt(np(1-p)) = sqrt(10*(0.5)(1-0.5)) = sqrt(5*0.5) = sqrt(2.5) = 1.5811