Binomial Probability: Guessing Answers
Each question has 5 possible answers of which only one is correct.
a) What is the probability the student will guess them all right?
b) The probability that he will guess AT MOST 12 correct.
c) The probability that he will guess at least one correct.
d) The mean and standard deviation of the number of the correct answers
e) Estimate the probability of the number of correct answers that will fall within the limits mean +- 2 variance.