試題詳解

116. A student takes a multiple-choice test with 40 questions. The probability that the student answers a given question correctly is 0.5, independent of all other questions. The probability that the student answers more than N questions correctly is greater than 0.10. The probability that the student answers more than N + 1 questions correctly is less than 0.10.
Calculate N using a normal approximation with the continuity correction.
(A) 23
(B) 25
(C) 32
(D) 33
(E) 35