The radius of mars is about 3400 km. olympus mons is a volcano on mars. at 27km high, olympus mons is the tallest volcano in the solar system. how far could an astronaut see on the surface of mars, standing on the peak on olympus mons?

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?