You are composing a 50 question multiple choice exam: you have 5 answer choices for each question (consisting of 1 correct answer and 4 incorrect answers). A correct answer is worth 3 points, an incorrect answer is worth 0. Unfortunately you have not had time to study the material and you answer randomly. Let X be the grade of a student in the exam. Determine the expectation of X and its standard deviation. A. E(X)=28 and ox=5.5 B. E(X)=28 and ox=8.5 C. E(X)=30 and ox=5.5 D. E(X)=30 and ox=8.5 E. E(X)=32 and ox=5.5 F. E(X)=32 and ox= 8.5 G. E(X)=34 and ox=5.5 H. E(X)=34 and ox=8.5