Susie gains more weight over christmas than any other time of the year. christmas makes susie gain weight. this conclusion a) justifiable, because christmas is in december. b) justifiable, because susie is happier at christmas. c) justifiable, because everyone gains weight at christmas. d) not justifiable, because there is another variable to consider.

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?