The table shows whether a hospital patient admitted during a given time period had or did not have an x ray and whether the patient had or did not have surgery during that hospital stay. one patient is randomly selected. what is the probability that the patient did not have surgery?
write the probability as a percent.
round to the nearest tenth of a percent as needed.
had surgery did not have
surgery
had and x ray 12 7

did not have 5. 33
and x ray

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?