Two groups separately performed an experiment by tossing a coin in the air. group a performed 50 trials and group b performed 100 trials. each group recorded the results in the table below:
group heads tails
a 30 20
b 52 48
what conclusion can be drawn about the number of trials and the probability of the coin landing on heads or tails?

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?