2. denine sees a scarf for 70 pesos and wants to know if it is in her budget for
souvenirs. use ratio reasoning to find the approximate cost of the scarf in
dollars, to the nearest half-dollar. (there will be a small error from rounding
the value of the peso.)

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?