Question

The following data gives the number of boys of a particular age in a class of 40 students.
calculate the mean age of students:
Age (in years) 15 16 17 18 19 20
No.of students 3 8 10 10 5 4

Answer 1

mean= sum of all observations/number of observations

15*3=45

16*8=128

17*10=170

18*10=180

19*5=95

20*4=80

45+128+170+180+95+80/40=17.45

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