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Direct Method of Finding Mean

The average a...

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The average age of 30 student is 20 year and average age of 20 other student is 30 year. The average age of total number of student is

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Q. The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. The average age of the remaining students is

Q. The Average age of 20 students in a class is 16 yars.One student whose age is 18 years has left the class. Find out average age of rest of the students.

Q. The average age of a teacher and three students is

20

years. If all students are of equal age and the difference between the age of the teacher and that of a student is

20

years, then the age of the teacher is

Q. In a group of

20

students the average age of the students is

10

years. A boy leaves the group and the average is decreased by

1

year. Find the age of that boy.

Q. Choose the correct answer from the alternative given.
The average age of 15 students of a class is 15 years Out of these the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is:

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Direct Method of Finding Mean

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