A student knows correct answers to 6 questions out of 8 questions from the book.(A)If a professor asks 5 questions from the book, what is the probability that a student knows correct answers to at least 4 of these questions?(B)Let X be the number of questions that can be answered correctly by thestudent from a sample of 5 questions asked by the professor. Find themean and the standard deviation of X

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A: GivenMean(μ)=155.9standard deviation(σ)=20.4sample size(n)=40

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A: Given that, Mean = 88 Standard deviation = 12

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