Compute the Mean and Standard Deviation of a Binomial Random Variable
-A quiz consists of 930 true or false questions. If the student guesses on each question, what is the standard deviation of the number of correct answers
A) 15.2479507
B) 0
C) 2
D) 21.5638587

Question

Quizplus · Accepted Answer

The standard deviation of a binomial distribution is calculated using the formula √(n * p * (1-p)), where n is the number of trials (930) and p is the probability of success (0.5 for guessing). This gives √(930 * 0.5 * 0.5) = 15.2479507.