Question

there are 20 students in a drama class the mean age of 12 students is 18 years and remain 8 students mean age is 23 yrs find mean age of all students
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Answer 1

Step-by-step explanation:

Total sum of age of 12 students = 12*18 = 216;

Total sum of age of 8 students = 8*23 = 184;

Total sum of age of 20 students = 216+184 = 400;

Mean age of all the students = total age / number of students;

= 400/20 = 20 year