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You have a 5question multiplechoice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly?
 one year ago
 one year ago
You have a 5question multiplechoice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly?
 one year ago
 one year ago

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jim_thompson5910Best ResponseYou've already chosen the best response.0
this is a binomial distribution problem, so you'll use the formula P(X = k) = (n C k)*(p)^(k)*(1p)^(nk) in this case n = 5 p =1/4 = 0.25 k = 3
 one year ago

bcr123Best ResponseYou've already chosen the best response.0
i am confused about the X and the C in the equation
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
n C k is the combination formula, so you'll either use a calculator or this formula n C k = (n!)/(k!*(nk)!)
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
and don't worry about the X
 one year ago
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