If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of 21 and 3 of 22 years, the average age of the group is

If out of 10 selected students for an examination, 3 were of 20 years,

1.	If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of 21 and 3 of 22 years, the average age of the group is
A.	22 years
B.	21 years
C.	21.5 years
D.	20 years
Answer» C. 21.5 years

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If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of 21 and 3 of 22 years, the average age of the group is

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