K A variable is normally distributed with mean 8 and standard deviation 2. a. Find the percentage of all possible values of the variable that lie between 7 and 12. b. Find the percentage of all possible values of the variable that are at least 6. c. Find the percentage of all possible values of the variable that are at most 4. Click here to view page 1 of the table of areas under the standard normal curve. Click here to view page 2 of the table of areas under the standard normal curve. a. The percentage of all possible values of the variable that lie between 7 and 12 is (Round to two decimal places as needed.) b. The percentage of all possible values of the variable that are at least 6 is %. (Round to two decimal places as needed.) c. The percentage of all possible values of the variable that are at most 4 is %. (Round to two decimal places as needed.) %.