a) Let c be the number of right guesses. the probability of c answers =.25 and probability of the wrong answer is 1-.25=.75 c distribution is in the parameter of (20, .25). b) mean = 20 * .25== 5 c) p of c guess =.25 ^20 =9.095* 10 ^-13 d) p of 10 c guess =.014 or 1.4% it is not possible for him to have 10 right guess.
