Double checking to see if i'm right! i believe that it's 108 but i'm not too sure!! can anyone tell me?? :))

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?