Find the Standard Deviation of the Binomial Random Variable

Multiple Choice

Find the standard deviation of the binomial random variable.
-On a multiple choice test with 10 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the random
Variable X, the number of correct answers.

A) 1.299
B) 1.342
C) 1.369
D) 1.273