Reading scores. The grade-level reading scores from a reading test given to a random sample of 12 students in an urban high school graduating class are:

7	7	14	8
8	10	11	10
10	8	15	15

a. Find the mean of the reading scores. (Type an integer or a decimal. Round to two decimal places.)

b. Find the standard deviation of the reading scores.(Type an integer or a decimal. Round to two decimal places.)