A student takes a true-false test that has 13 questions and guesses randomly at each answer. Let X be the number of questions answered correctly. Find P(Fewer than 4)
A) 0.8666
B) 0.1334
C) 0.0112
D) 0.0461

Question

Quizplus · Accepted Answer

The number of questions answered correctly, X, follows a binomial distribution with n = 13 and p = 0.5. To find P(X < 4), calculate the cumulative probability for X = 0, 1, 2, and 3. The sum of these probabilities is approximately 0.0461.

A Student Takes a True-False Test That Has 13 Questions