Rita needs to replace the ink cartridge for her printer. she found four brands that make replacement cartridges. the table below shows the prices and number of pages expected from each brand.
ink cartridges
brand
price
number of pages
a
$20.00
200
b
$25.00
125
c
$30.00
150
d
$35.00
which brand is the best buy?
a
b
c
d

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?

What number is 7 units left of -15?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.