As soon as possible

a student randomly selects one of the marvel from the group of marble shown below and then tosses a balance coin a: what is the probability that the student will select a green marble and then toss a hedge? show all your work. b: use your answer in a to determine the likelihood that the student will select a green marble and then toss heads. explain your reasoning in complete sentences.

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?