The average age of a class of 20 students is 20 years. A student whose age is 20 years leaves the class. Find the new average age of the class (in years).
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Hey,
Thanks for asking this question.
If class of 20 students has an average age of 20,
This means that if a student of age 20 leaves,that will not impact on the average age of a class and average age of a class will remain 20.
We can prove it mathmatecally as well,
Total number of students = 20
Average age of 20 students is 20
So total sum of ages = 20×20 = 400
If a student of age 20 leaves,
total students remain = 19
so total sum of ages = 19×20 = 380
So average age of 19 students = 380/19 = 20.
(hence proved)
■■■Hope my answer helped
Thanks for asking this question.
If class of 20 students has an average age of 20,
This means that if a student of age 20 leaves,that will not impact on the average age of a class and average age of a class will remain 20.
We can prove it mathmatecally as well,
Total number of students = 20
Average age of 20 students is 20
So total sum of ages = 20×20 = 400
If a student of age 20 leaves,
total students remain = 19
so total sum of ages = 19×20 = 380
So average age of 19 students = 380/19 = 20.
(hence proved)
■■■Hope my answer helped
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