The manufacturer of a low-calorie dairy drink wishes to compare the taste appeal of a new formula (formula B) with that of the standard formula (formula A). Each of three judges is given three glasses in random order, two containing formula A and the other
containing formula B. Each judge is asked to state which glass he most enjoyed. Suppose that two formulas are equally attractive. Let X be the number of judges stating a preference for the new formula?A).
Find the standard deviation of a random variable X.