Triangle X Y Z is shown. Angle Z W X is a right angle. An altitude is drawn from point W to point Y on side ZX
to form a right angle. The length of W Y is 4, the length of Y X is a, the length of Z Y is 3, the length of Z W is C, and
the length of W X is b.
What is the value of a?
O 5units
O 5 1/3 units
O 6 2/3 units
7 Units

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?