Question

Please help me these problem in R-Code

On a multiple-choice exam with **four** possible answers for each of the five questions, what is the probability that a student would get four or more correct answers just by guessing?

Hint: Use the fact that $P(E ∩ F) = P(E) · P(F)$ for two independant event (generalized for more than events) Getting one answer correct is independant of another.

Also $$P(at least 4) = P(exactly 4) + P(exactly 5)$$, the last events are mutually exclusive so $P(A \cup B) = P(A) + P(B)$

YOUR CODE HERE:

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Out of 200 students who addopt this test taking approach how many are expected to get at least 4 correct? **Hint:** Use Binomial experiment settings to answer this questions.

#### Solution:

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Answer 1