Find the number of students who have access to both a computer and mobile phone?​

Which of the following contains a variable?

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?

Acoin is tossed 4 times which of the following represents the probability of the coin landing on heads all 4 times