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
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By: anil on 05 May 2019 01.54 am
It is given that 10 students are selected and 3 were of 20 years age, 4 of 21 and 3 of 22 years As we know that average age = $$frac{Sum of Ages}{NumberofStudents}$$ =$$frac{(20x3)+(21x4)+(22x3)}{10}$$ = 21 years
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