Find the mean and variance for the random variable
The 2009 GRE has 200 questions with 3 possible answers and only one of which is correct. For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
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For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
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There are 3 gene types S1, S2 and S3 in a large population. They each have the relative frequency of a^2, 2a(1-a) and (1-a)^2 respectively where "a" is the gene frequency. Suppose that in a random sample of size n, there x1, x2 and x3 of the three
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