Assume X is a binomial random variable. If n = 20 and p = 0.20, find P (r = 2 successes). 0.1369 0.8631 0.04 0.3280
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In this case, n = 20, p = 0.20, and r = 2. Let's substitute these values into the formula: P(X = 2) = (20C2) * (0.20)^2 * (1-0.20)^(20-2) To calculate the binomial coefficient (20C2), we can use the formula: (20C2) = 20! / (2! * (20-2)!) = 20! / (2! * 18!) = Show more…
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