PLEASE HEL , WILL GIVE BRAINLIES
A community center is offering a discount on swimming passes. The regular cost for a swimming pass is $6.00. Jake, Liza, and Manuel each buy a swimming pass at the community center. After the discount, the total cost for the three passes is $14.40. What is the discount the community center is offering?

Question 3 options:

20%

42%

71%

80%

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?