Calculus and Above

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questions on an SAT test...

Assume that random guesses are made for multiple choice questions on an SAT test, so that there are n=9 trials, each with probability of success (correct) given by p=0.65. Find the indicated probability for the number of correct answers.

Find the probability that the number x of correct answers is fewer than 4.

P(X<4)=

Find the probability that the number x of correct answers is fewer than 4.

P(X<4)=

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