Which of the following problems can NOT be solved by statistics? A. Getting the average score of 20 students.

B. Adding the number of male and female in a classroom.

C. When a number x is added to the data set 4, 8, 20, 25, 32 the new mean is 15. Find the value of x

D. 88% of people questioned feel that is it is better to exercise at least twice a week. Sample size is 100 how many people involved?​​