n = 30
p = 1/4 = 0.25
P(X = 12) = 30C12 * 0.2512 * (1 - 0.25)30-12 = 0.02906 (ans)
QUESTION 14 QUESTION 14 Find the indicated binomial probability. Round to five decimal places when necessary....
indicated probability by using the normal distribution as an approximation to the binomial distribution. 12) A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If Estimate the all answers are random guesses, estimate the probability of getting at least 20% correct.
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