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?

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.