(Answered) A calculus student takes a 20 question multiple choice test

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A calculus student takes a 20 question multiple choice test with five answer choices for each question. Find the probability of getting atleast 70 percent of the question correct?

Suppose a family has 5 children and that the probability of having girls is 1/2. What is the probabilty of having at least three boys ? What is the probabilty of having no girls?

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