Hi,
Correct: sum of heights/# of peole = mean hieght
Letting x represent the number of students
1472in/x = 64in
1472/64 = x
23 = x the number of students measured
23 in this sample of students. Hint: 23 = 11 + 1 + 11 (middle student is mean height)
twelve are 5ft 2 in 'or' taller and 11 are shorter then 5ft 2in