Seven hound red and fifteen tickets were sold a raffle if you bought 12 of them what is the probability that you have the winning ticket

How to use order of operation in 20 divide by 4 multiply 5 = 1

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?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?