A mother wants to invest $13000 for her sons future education. She invests a portion of the money in a bank certificate of deposit (CD account) which earns 4% and the remainder in a saving bonds that earns 7%. If the total interest earned after one year is $780 how much money was invested in the cd account

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

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?