polynomial question
(answer fully, or you will be reported)
(sorry, but people steal points)

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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?

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2