the average of 60 students in a class is 18 years. 7 students left the class whose average age was 16.25 years and 5 new students joined the class whose age was respectively 17, 18, 21.5, 23.75 and 14 years. find the present average age of the students in the class.
Answers
Given : the average age of 60 students in a class is 18 years.
7 students left the class whose average age was 16.25 years
5 new students joined the class whose age was respectively 17, 18, 21.5, 23.75 and 14 years.
To find : the present average age of the students in the class.
Solution:
average age of 60 students in a class is 18 years.
Total age = 60 x 18 = 1080 Years
7 students left the class whose average age was 16.25 years
Total Age of 7 students who left = 7 x 16.25 = 113.75 years
5 students joined new with 17, 18, 21.5, 23.75 and 14 years.
Total Age of 5 students = 17 + 18 + 21.5 + 23.75 + 14
= 94.25 year
Present number of students = 60 - 7 + 5 = 58
Present total age = 1080 - 113.75 + 94.25
= 1,060.5
present Average age = 1060.5/58
= 18.284
present average age of the students in the class. = 18.284 years
Learn More:
average age of a group of people is four times the no of people in ...
https://brainly.in/question/9805212
The average ages in years) of persons in groups A, B and C are ...
https://brainly.in/question/13429018
average age of 15 students is 18years. the average age of 9 ...
https://brainly.in/question/7773123