Question

please solve the question no.11 and 12

Answer 1

Dear I don't know the answer of no.11 but I know the answer of no. 12. Ok sorry dear!!!!!

12. Mean age of 40 students = 16 yrs

Mean = Sum of the age / No. of students


16 = Sum of the age / 40

Sum of the age = 40 X 16 = 640

Mean age of 60 students = 20 yrs

Mean = Sum of the age/
No. of students

20 = Sum of the age / 60

Sum of the age = 60 X 20
= 1200

Mean = Sum of the age /
No. of students

Mean = 1200 + 640 / 100

Mean = 1840 / 100

Mean = 18.4 yrs

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