Question 1(Multiple Choice Worth 4 points) (08.05)
Which of the following ordered pairs represents the solution to the system given below?
x - 4y = 7
5x + y = 6
O (3,-1)
O (3, 1)
O (1.-3)
O(-1,-3)
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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?

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