SOLUTION: In a multiple choice exam of 100 questions, 4 possible answers were assigned for each question and only one answer is correct. if a student is answering these questions randomly, w
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Question 918648: In a multiple choice exam of 100 questions, 4 possible answers were assigned for each question and only one answer is correct. if a student is answering these questions randomly, what are the values of the two parameters, n and p of the binomial distribution? Calculate the expected value and standard deviation.
what is the chance to answer exactly 20 questions correctly?
What is the chance to answer exactly 30 questions correctly? Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! p(correct) = .25, q(incorrect) = .75
n = 100
P(x=20correct) = 100C20(.25^20)(.75)^80 0r P = binompdf(100, .25, 20)
P(x=30correct) = 100C30(.25^30)(.75)^70 0r P = binompdf(100, .25, 30)
mean = .25•100 = 25 and s =
