Kathleen sold her steer at auction for $4,000. She put the money into a savings account earning 3.2% annual interest. She withdrew the money and closed the account 8 months later to purchase her next steer. How much money did she have to purchase the steer?

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?