Some standardized tests, such as the sat test, incorporate a penalty for wrong answers. for example, a multiple-choice question with five possible answers will have 1 point awarded for a correct answer and 1/4 point lost for an incorrect answer. find the expected number of points (mean) received for a multiple-choice question with five possible answers when a student just guesses at random.

One positive number is 9 more than twice another. if their product is 95, find the numbers

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder