The average age of 54 girls in a class w...

The average age of 54 girls in a class was calculated as 14 yr. It was later realized that the actual age of one of the girls in the class was 10.5 yr but it was calculated as 13yr . What is the average age (round off) of the girls in the class ?

10.50 yr

12.50 yr

12 yr

14 yr

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