Button jar contains 5 red buttons, 3 blue buttons, 1 green button and 1 yellow button. What is the probability that if I reach in and pull out a button randomly, it will be blue? Using the same jar, with 5 red buttons, 3 blue buttons, 1 green button and 1 yellow button. I pull out 1 button, replace it and shake the jar, and pull out a second button. What is the possibility that neither button is red?

For a field trip to the zoo, 4 students rode in cars and the rest filled nine busess. how many students were in each bus if 472 students were on the trip

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?

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?