Acomputer system allows each user to choose a password using any combination of uppercase letters (a- z), lowercase letters (a-z), digits (0-9) and special characters f@$%& ! ? g. how many di erent passwords are possible: 1. if any combination is possible and passwords are of length 8 exactly? 2. if passwords can't start with a special character and passwords are of length 8 exactly? 3. if any combination is possible and passwords can be any length between 8 and 10 characters? 4. if any combination is possible and passwords are of length 8 exactly but there must be at least one special character or one digit?

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average