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Mathematics 6 Online
OpenStudy (anonymous):

An instructor develops a four-option, multiple choice exam. A student decides to guess randomly on each question. Given that the probability of guessing correctly on each question is 0.25. Suppose the exam has 20 questions, answer the following questions: a) What is the probability that the student will correctly guess at most 10 questions? b) What is the probability that a student will correctly guess at least 3 questions? c) What is the standard deviation of the grade to be obtained by guessing?

OpenStudy (anonymous):

Answers I got, but not completely sure if they're correct: a)0.996 b)0.9087 c)1.94

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